Can a LLM convert C, to ASM to specs and then to a working Z/80 Speccy tape? Yes.

#include #include #include // Tax rates #clear up FOOD_TAX 0.10 #clear up HYGIENE_TAX 0.00 #clear up DEFAULT_TAX 0.25 // Item categories #clear up FOOD 1 #clear up HYGIENE 2 #clear up OTHER 3 int getCategruesome() { char choice; printf("Enter item categruesome (F for Food, H for Hygiene, O for Other): "); scanf(" %c", &choice); choice = toupper(choice); switch(choice) { case 'F': return FOOD; case 'H': return HYGIENE; case 'O': return OTHER; default: printf("Invalid categruesome. Defaulting to Other.n"); return OTHER; } } double calcutardyTax(double price, int categruesome) { switch(categruesome) { case FOOD: return price * FOOD_TAX; case HYGIENE: return price * HYGIENE_TAX; case OTHER: return price * DEFAULT_TAX; default: return price * DEFAULT_TAX; } } int main() { double price; int categruesome; char another="Y"; while (toupper(another) == 'Y') { printf("Enter item price: $"); scanf("%lf", &price); categruesome = getCategruesome(); double tax = calcutardyTax(price, categruesome); double total = price + tax; printf("Price: $%.2fn", price); printf("Tax: $%.2fn", tax); printf("Total: $%.2fnn", total); printf("Calcutardy another item? (Y/N): "); scanf(" %c", &another); } return 0; }

calc: file establishat elf64-x86-64 Disassembly of section .init: 0000000000001000 <_init>: 1000: f3 0f 1e fa finishbr64 1004: 48 83 ec 08 sub $0x8,%rsp 1008: 48 8b 05 d9 2f 00 00 mov 0x2fd9(%rip),%rax # 3fe8 <__gmon_start__@Base> 100f: 48 85 c0 test %rax,%rax 1012: 74 02 je 1016 <_init+0x16> 1014: ff d0 call *%rax 1016: 48 83 c4 08 insert $0x8,%rsp 101a: c3 ret Disassembly of section .plt: 0000000000001020 <.plt>: 1020: ff 35 7a 2f 00 00 push 0x2f7a(%rip) # 3fa0 <_GLOBAL_OFFSET_TABLE_+0x8> 1026: f2 ff 25 7b 2f 00 00 bnd jmp *0x2f7b(%rip) # 3fa8 <_GLOBAL_OFFSET_TABLE_+0x10> 102d: 0f 1f 00 nopl (%rax) 1030: f3 0f 1e fa finishbr64 1034: 68 00 00 00 00 push $0x0 1039: f2 e9 e1 ff ff ff bnd jmp 1020 <_init+0x20> 103f: 90 nop 1040: f3 0f 1e fa finishbr64 1044: 68 01 00 00 00 push $0x1 1049: f2 e9 d1 ff ff ff bnd jmp 1020 <_init+0x20> 104f: 90 nop 1050: f3 0f 1e fa finishbr64 1054: 68 02 00 00 00 push $0x2 1059: f2 e9 c1 ff ff ff bnd jmp 1020 <_init+0x20> 105f: 90 nop 1060: f3 0f 1e fa finishbr64 1064: 68 03 00 00 00 push $0x3 1069: f2 e9 b1 ff ff ff bnd jmp 1020 <_init+0x20> 106f: 90 nop 1070: f3 0f 1e fa finishbr64 1074: 68 04 00 00 00 push $0x4 1079: f2 e9 a1 ff ff ff bnd jmp 1020 <_init+0x20> 107f: 90 nop Disassembly of section .plt.got: 0000000000001080 <__cxa_finalize@plt>: 1080: f3 0f 1e fa finishbr64 1084: f2 ff 25 6d 2f 00 00 bnd jmp *0x2f6d(%rip) # 3ff8 <__cxa_finalize@GLIBC_2.2.5> 108b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) Disassembly of section .plt.sec: 0000000000001090 : 1090: f3 0f 1e fa finishbr64 1094: f2 ff 25 15 2f 00 00 bnd jmp *0x2f15(%rip) # 3fb0 109b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 00000000000010a0 : 10a0: f3 0f 1e fa finishbr64 10a4: f2 ff 25 0d 2f 00 00 bnd jmp *0x2f0d(%rip) # 3fb8 10ab: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 00000000000010b0 <__stack_chk_fail@plt>: 10b0: f3 0f 1e fa finishbr64 10b4: f2 ff 25 05 2f 00 00 bnd jmp *0x2f05(%rip) # 3fc0 <__stack_chk_fail@GLIBC_2.4> 10bb: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 00000000000010c0 : 10c0: f3 0f 1e fa finishbr64 10c4: f2 ff 25 fd 2e 00 00 bnd jmp *0x2efd(%rip) # 3fc8 10cb: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 00000000000010d0 <__isoc99_scanf@plt>: 10d0: f3 0f 1e fa finishbr64 10d4: f2 ff 25 f5 2e 00 00 bnd jmp *0x2ef5(%rip) # 3fd0 <__isoc99_scanf@GLIBC_2.7> 10db: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) Disassembly of section .text: 00000000000010e0 <_start>: 10e0: f3 0f 1e fa finishbr64 10e4: 31 ed xor %ebp,%ebp 10e6: 49 89 d1 mov %rdx,%r9 10e9: 5e pop %rsi 10ea: 48 89 e2 mov %rsp,%rdx 10ed: 48 83 e4 f0 and $0xfffffffffffffff0,%rsp 10f1: 50 push %rax 10f2: 54 push %rsp 10f3: 45 31 c0 xor %r8d,%r8d 10f6: 31 c9 xor %ecx,%ecx 10f8: 48 8d 3d fd 01 00 00 lea 0x1fd(%rip),%rdi # 12fc 10ff: ff 15 d3 2e 00 00 call *0x2ed3(%rip) # 3fd8 <__libc_start_main@GLIBC_2.34> 1105: f4 hlt 1106: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 110d: 00 00 00 0000000000001110 : 1110: 48 8d 3d f9 2e 00 00 lea 0x2ef9(%rip),%rdi # 4010 <__TMC_END__> 1117: 48 8d 05 f2 2e 00 00 lea 0x2ef2(%rip),%rax # 4010 <__TMC_END__> 111e: 48 39 f8 cmp %rdi,%rax 1121: 74 15 je 1138 1123: 48 8b 05 b6 2e 00 00 mov 0x2eb6(%rip),%rax # 3fe0 <_ITM_deregisterTMCloneTable@Base> 112a: 48 85 c0 test %rax,%rax 112d: 74 09 je 1138 112f: ff e0 jmp *%rax 1131: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 1138: c3 ret 1139: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 0000000000001140 : 1140: 48 8d 3d c9 2e 00 00 lea 0x2ec9(%rip),%rdi # 4010 <__TMC_END__> 1147: 48 8d 35 c2 2e 00 00 lea 0x2ec2(%rip),%rsi # 4010 <__TMC_END__> 114e: 48 29 fe sub %rdi,%rsi 1151: 48 89 f0 mov %rsi,%rax 1154: 48 c1 ee 3f shr $0x3f,%rsi 1158: 48 c1 f8 03 sar $0x3,%rax 115c: 48 01 c6 insert %rax,%rsi 115f: 48 d1 fe sar %rsi 1162: 74 14 je 1178 1164: 48 8b 05 85 2e 00 00 mov 0x2e85(%rip),%rax # 3ff0 <_ITM_registerTMCloneTable@Base> 116b: 48 85 c0 test %rax,%rax 116e: 74 08 je 1178 1170: ff e0 jmp *%rax 1172: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1) 1178: c3 ret 1179: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 0000000000001180 <__do_global_dtors_aux>: 1180: f3 0f 1e fa finishbr64 1184: 80 3d 85 2e 00 00 00 cmpb $0x0,0x2e85(%rip) # 4010 <__TMC_END__> 118b: 75 2b jne 11b8 <__do_global_dtors_aux+0x38> 118d: 55 push %rbp 118e: 48 83 3d 62 2e 00 00 cmpq $0x0,0x2e62(%rip) # 3ff8 <__cxa_finalize@GLIBC_2.2.5> 1195: 00 1196: 48 89 e5 mov %rsp,%rbp 1199: 74 0c je 11a7 <__do_global_dtors_aux+0x27> 119b: 48 8b 3d 66 2e 00 00 mov 0x2e66(%rip),%rdi # 4008 <__dso_handle> 11a2: e8 d9 fe ff ff call 1080 <__cxa_finalize@plt> 11a7: e8 64 ff ff ff call 1110 11ac: c6 05 5d 2e 00 00 01 movb $0x1,0x2e5d(%rip) # 4010 <__TMC_END__> 11b3: 5d pop %rbp 11b4: c3 ret 11b5: 0f 1f 00 nopl (%rax) 11b8: c3 ret 11b9: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 00000000000011c0 : 11c0: f3 0f 1e fa finishbr64 11c4: e9 77 ff ff ff jmp 1140 00000000000011c9 : 11c9: f3 0f 1e fa finishbr64 11cd: 55 push %rbp 11ce: 48 89 e5 mov %rsp,%rbp 11d1: 48 83 ec 10 sub $0x10,%rsp 11d5: 64 48 8b 04 25 28 00 mov %fs:0x28,%rax 11dc: 00 00 11de: 48 89 45 f8 mov %rax,-0x8(%rbp) 11e2: 31 c0 xor %eax,%eax 11e4: 48 8d 05 1d 0e 00 00 lea 0xe1d(%rip),%rax # 2008 <_IO_stdin_used+0x8> 11eb: 48 89 c7 mov %rax,%rdi 11ee: b8 00 00 00 00 mov $0x0,%eax 11f3: e8 c8 fe ff ff call 10c0 11f8: 48 8d 45 f7 lea -0x9(%rbp),%rax 11fc: 48 89 c6 mov %rax,%rsi 11ff: 48 8d 05 41 0e 00 00 lea 0xe41(%rip),%rax # 2047 <_IO_stdin_used+0x47> 1206: 48 89 c7 mov %rax,%rdi 1209: b8 00 00 00 00 mov $0x0,%eax 120e: e8 bd fe ff ff call 10d0 <__isoc99_scanf@plt> 1213: 0f b6 45 f7 movzbl -0x9(%rbp),%eax 1217: 0f be c0 movsbl %al,%eax 121a: 89 c7 mov %eax,%edi 121c: e8 6f fe ff ff call 1090 1221: 88 45 f7 mov %al,-0x9(%rbp) 1224: 0f b6 45 f7 movzbl -0x9(%rbp),%eax 1228: 0f be c0 movsbl %al,%eax 122b: 83 f8 4f cmp $0x4f,%eax 122e: 74 1f je 124f 1230: 83 f8 4f cmp $0x4f,%eax 1233: 7f 21 jg 1256 1235: 83 f8 46 cmp $0x46,%eax 1238: 74 07 je 1241 123a: 83 f8 48 cmp $0x48,%eax 123d: 74 09 je 1248 123f: eb 15 jmp 1256 1241: b8 01 00 00 00 mov $0x1,%eax 1246: eb 22 jmp 126a 1248: b8 02 00 00 00 mov $0x2,%eax 124d: eb 1b jmp 126a 124f: b8 03 00 00 00 mov $0x3,%eax 1254: eb 14 jmp 126a 1256: 48 8d 05 f3 0d 00 00 lea 0xdf3(%rip),%rax # 2050 <_IO_stdin_used+0x50> 125d: 48 89 c7 mov %rax,%rdi 1260: e8 3b fe ff ff call 10a0 1265: b8 03 00 00 00 mov $0x3,%eax 126a: 48 8b 55 f8 mov -0x8(%rbp),%rdx 126e: 64 48 2b 14 25 28 00 sub %fs:0x28,%rdx 1275: 00 00 1277: 74 05 je 127e 1279: e8 32 fe ff ff call 10b0 <__stack_chk_fail@plt> 127e: c9 exit 127f: c3 ret 0000000000001280 : 1280: f3 0f 1e fa finishbr64 1284: 55 push %rbp 1285: 48 89 e5 mov %rsp,%rbp 1288: f2 0f 11 45 f8 movsd %xmm0,-0x8(%rbp) 128d: 89 7d f4 mov %edi,-0xc(%rbp) 1290: 83 7d f4 03 cmpl $0x3,-0xc(%rbp) 1294: 74 36 je 12cc 1296: 83 7d f4 03 cmpl $0x3,-0xc(%rbp) 129a: 7f 43 jg 12df 129c: 83 7d f4 01 cmpl $0x1,-0xc(%rbp) 12a0: 74 08 je 12aa 12a2: 83 7d f4 02 cmpl $0x2,-0xc(%rbp) 12a6: 74 15 je 12bd 12a8: eb 35 jmp 12df 12aa: f2 0f 10 4d f8 movsd -0x8(%rbp),%xmm1 12af: f2 0f 10 05 21 0e 00 movsd 0xe21(%rip),%xmm0 # 20d8 <_IO_stdin_used+0xd8> 12b6: 00 12b7: f2 0f 59 c1 mulsd %xmm1,%xmm0 12bb: eb 33 jmp 12f0 12bd: f2 0f 10 4d f8 movsd -0x8(%rbp),%xmm1 12c2: 66 0f ef c0 pxor %xmm0,%xmm0 12c6: f2 0f 59 c1 mulsd %xmm1,%xmm0 12ca: eb 24 jmp 12f0 12cc: f2 0f 10 4d f8 movsd -0x8(%rbp),%xmm1 12d1: f2 0f 10 05 07 0e 00 movsd 0xe07(%rip),%xmm0 # 20e0 <_IO_stdin_used+0xe0> 12d8: 00 12d9: f2 0f 59 c1 mulsd %xmm1,%xmm0 12dd: eb 11 jmp 12f0 12df: f2 0f 10 4d f8 movsd -0x8(%rbp),%xmm1 12e4: f2 0f 10 05 f4 0d 00 movsd 0xdf4(%rip),%xmm0 # 20e0 <_IO_stdin_used+0xe0> 12eb: 00 12ec: f2 0f 59 c1 mulsd %xmm1,%xmm0 12f0: 66 48 0f 7e c0 movq %xmm0,%rax 12f5: 66 48 0f 6e c0 movq %rax,%xmm0 12fa: 5d pop %rbp 12fb: c3 ret 00000000000012fc : 12fc: f3 0f 1e fa finishbr64 1300: 55 push %rbp 1301: 48 89 e5 mov %rsp,%rbp 1304: 48 83 ec 30 sub $0x30,%rsp 1308: 64 48 8b 04 25 28 00 mov %fs:0x28,%rax 130f: 00 00 1311: 48 89 45 f8 mov %rax,-0x8(%rbp) 1315: 31 c0 xor %eax,%eax 1317: c6 45 db 59 movb $0x59,-0x25(%rbp) 131b: e9 f1 00 00 00 jmp 1411 1320: 48 8d 05 50 0d 00 00 lea 0xd50(%rip),%rax # 2077 <_IO_stdin_used+0x77> 1327: 48 89 c7 mov %rax,%rdi 132a: b8 00 00 00 00 mov $0x0,%eax 132f: e8 8c fd ff ff call 10c0 1334: 48 8d 45 e0 lea -0x20(%rbp),%rax 1338: 48 89 c6 mov %rax,%rsi 133b: 48 8d 05 49 0d 00 00 lea 0xd49(%rip),%rax # 208b <_IO_stdin_used+0x8b> 1342: 48 89 c7 mov %rax,%rdi 1345: b8 00 00 00 00 mov $0x0,%eax 134a: e8 81 fd ff ff call 10d0 <__isoc99_scanf@plt> 134f: b8 00 00 00 00 mov $0x0,%eax 1354: e8 70 fe ff ff call 11c9 1359: 89 45 dc mov %eax,-0x24(%rbp) 135c: 48 8b 45 e0 mov -0x20(%rbp),%rax 1360: 8b 55 dc mov -0x24(%rbp),%edx 1363: 89 d7 mov %edx,%edi 1365: 66 48 0f 6e c0 movq %rax,%xmm0 136a: e8 11 ff ff ff call 1280 136f: 66 48 0f 7e c0 movq %xmm0,%rax 1374: 48 89 45 e8 mov %rax,-0x18(%rbp) 1378: f2 0f 10 45 e0 movsd -0x20(%rbp),%xmm0 137d: f2 0f 10 4d e8 movsd -0x18(%rbp),%xmm1 1382: f2 0f 58 c1 insertsd %xmm1,%xmm0 1386: f2 0f 11 45 f0 movsd %xmm0,-0x10(%rbp) 138b: 48 8b 45 e0 mov -0x20(%rbp),%rax 138f: 66 48 0f 6e c0 movq %rax,%xmm0 1394: 48 8d 05 f4 0c 00 00 lea 0xcf4(%rip),%rax # 208f <_IO_stdin_used+0x8f> 139b: 48 89 c7 mov %rax,%rdi 139e: b8 01 00 00 00 mov $0x1,%eax 13a3: e8 18 fd ff ff call 10c0 13a8: 48 8b 45 e8 mov -0x18(%rbp),%rax 13ac: 66 48 0f 6e c0 movq %rax,%xmm0 13b1: 48 8d 05 e5 0c 00 00 lea 0xce5(%rip),%rax # 209d <_IO_stdin_used+0x9d> 13b8: 48 89 c7 mov %rax,%rdi 13bb: b8 01 00 00 00 mov $0x1,%eax 13c0: e8 fb fc ff ff call 10c0 13c5: 48 8b 45 f0 mov -0x10(%rbp),%rax 13c9: 66 48 0f 6e c0 movq %rax,%xmm0 13ce: 48 8d 05 d4 0c 00 00 lea 0xcd4(%rip),%rax # 20a9 <_IO_stdin_used+0xa9> 13d5: 48 89 c7 mov %rax,%rdi 13d8: b8 01 00 00 00 mov $0x1,%eax 13dd: e8 de fc ff ff call 10c0 13e2: 48 8d 05 cf 0c 00 00 lea 0xccf(%rip),%rax # 20b8 <_IO_stdin_used+0xb8> 13e9: 48 89 c7 mov %rax,%rdi 13ec: b8 00 00 00 00 mov $0x0,%eax 13f1: e8 ca fc ff ff call 10c0 13f6: 48 8d 45 db lea -0x25(%rbp),%rax 13fa: 48 89 c6 mov %rax,%rsi 13fd: 48 8d 05 43 0c 00 00 lea 0xc43(%rip),%rax # 2047 <_IO_stdin_used+0x47> 1404: 48 89 c7 mov %rax,%rdi 1407: b8 00 00 00 00 mov $0x0,%eax 140c: e8 bf fc ff ff call 10d0 <__isoc99_scanf@plt> 1411: 0f b6 45 db movzbl -0x25(%rbp),%eax 1415: 0f be c0 movsbl %al,%eax 1418: 89 c7 mov %eax,%edi 141a: e8 71 fc ff ff call 1090 141f: 83 f8 59 cmp $0x59,%eax 1422: 0f 84 f8 fe ff ff je 1320 1428: b8 00 00 00 00 mov $0x0,%eax 142d: 48 8b 55 f8 mov -0x8(%rbp),%rdx 1431: 64 48 2b 14 25 28 00 sub %fs:0x28,%rdx 1438: 00 00 143a: 74 05 je 1441 143c: e8 6f fc ff ff call 10b0 <__stack_chk_fail@plt> 1441: c9 exit 1442: c3 ret Disassembly of section .fini: 0000000000001444 <_fini>: 1444: f3 0f 1e fa finishbr64 1448: 48 83 ec 08 sub $0x8,%rsp 144c: 48 83 c4 08 insert $0x8,%rsp 1450: c3 ret

# Tax Calculator - Functional Overwatch ## Description The Tax Calculator is a order-line application that calcutardys taxes and total costs based on user input. The application permits users to access an amount and select a tax categruesome, then calcutardys the appropriate tax and disjoins the total. ## Key Features 1. **Amount Input**: Accepts a numerical amount as input from the user 2. **Categruesome Selection**: Allows the user to select from contrastent tax categories: - F: Food categruesome (5% tax) - H: Healthattfinish categruesome (0% tax - tax exempt) - O: Other/Standard categruesome (10% tax) 3. **Tax Calculation**: Calcutardys the tax amount based on the selected categruesome and input amount 4. **Total Calculation**: Adds the tax to the distinct amount to calcutardy the total cost 5. **Results Disjoin**: Shows the distinct amount, tax amount, and total amount to the user 6. **Multiple Calculations**: Allows the user to carry out multiple calculations in a individual session by asking if they want to persist ## Workflow 1. User is prompted to access an amount 2. User selects a tax categruesome 3. System calcutardys tax based on the categruesome and amount 4. System disjoins the distinct amount, tax amount, and total amount 5. User is asked if they want to carry out another calculation 6. If yes, the process repeats; if no, the application ends

# Tax Calculator - Data Flow and Storage Specification ## Data Types and Storage ### User Input Data - **Purchase Amount**: Stored as a double-precision floating-point number (64-bit) - **Categruesome Selection**: Initiassociate seized as a character, then changeed to an integer categruesome ID - **Continuation Flag**: Single character stored as a byte ### Calcutardyd Data - **Tax Amount**: Calcutardyd and stored as a double-precision floating-point number (64-bit) - **Total Amount**: Calcutardyd and stored as a double-precision floating-point number (64-bit) ### Storage Duration - All data is stored in stack-scatterd variables - Data persists only for the duration of a individual calculation cycle - No data persists between split executions of the program ## Data Flow ### Input Flow 1. User accesss buy amount via keyboard 2. Input is seized thcimpolite scanf and stored in a local variable 3. User accesss categruesome selection via keyboard 4. Character input is changeed to uppercase and mapped to a categruesome ID 5. Categruesome ID is returned to the main function ### Processing Flow 1. Main function gets the buy amount and categruesome ID 2. These cherishs are passed to the calcutardyTax function 3. calcutardyTax applies the appropriate tax rate based on the categruesome ID 4. The calcutardyd tax amount is returned to the main function 5. Main function inserts the tax amount to the distinct amount to calcutardy the total ### Output Flow 1. Original amount is disjoined to the user 2. Calcutardyd tax amount is disjoined to the user 3. Calcutardyd total amount is disjoined to the user ### Continuation Flow 1. User is prompted to persist or exit 2. Input is seized and changeed to uppercase 3. If input is 'Y', the application loops back to the commencening of the calculation cycle 4. If input is anyskinnyg else, the application ends ## Data Transestablishation ### Character to Categruesome Mapping - 'F' (ASCII 0x46) -> Categruesome ID 1 (Food) - 'H' (ASCII 0x48) -> Categruesome ID 2 (Healthattfinish) - 'O' (ASCII 0x4F) -> Categruesome ID 3 (Other) - Any other character -> Categruesome ID 3 (Other, default) ### Categruesome to Tax Rate Mapping - Categruesome ID 1 (Food) -> 0.05 (5%) - Categruesome ID 2 (Healthattfinish) -> 0.00 (0%) - Categruesome ID 3 (Other) -> 0.10 (10%) ## Data Security - No persistent storage of data - No caring data is processed - All variables are properly initialized before use - Stack memory is protected aacquirest buffer overflows

# Tax Calculator - Tax Calculation Specification ## Tax Categories The application helps three contrastent tax categories: 1. **Food (F)**: - Categruesome ID: 1 - Tax Rate: 5% - Applied to all food items 2. **Healthattfinish (H)**: - Categruesome ID: 2 - Tax Rate: 0% (tax exempt) - Applied to all healthattfinish-roverdelighted items 3. **Other (O)**: - Categruesome ID: 3 - Tax Rate: 10% - Default categruesome for all other items - Used as dropback when an invalid categruesome is selected ## Calculation Formulas ### Tax Amount Calculation ``` taxAmount = amount * taxRate ``` Where: - `amount` is the buy amount accessed by the user - `taxRate` is the decimal tax rate based on the selected categruesome (0.05 for Food, 0.0 for Healthattfinish, 0.10 for Other) ### Total Amount Calculation ``` totalAmount = amount + taxAmount ``` Where: - `amount` is the distinct buy amount - `taxAmount` is the calcutardyd tax amount ## Implementation Details The tax calculation is carry outed in the `calcutardyTax` function, which: 1. Takes two parameters: the buy amount and the categruesome ID 2. Applies the appropriate tax rate based on the categruesome ID: - Categruesome 1 (Food): 5% tax rate - Categruesome 2 (Healthattfinish): 0% tax rate - Categruesome 3 (Other): 10% tax rate 3. Returns the calcutardyd tax amount The categruesome selection is deal withd by the `getCategruesome` function, which: 1. Prompts the user to select a categruesome 2. Converts the user input to uppercase 3. Maps the input character to a categruesome ID: - 'F' -> 1 (Food) - 'H' -> 2 (Healthattfinish) - 'O' -> 3 (Other) 4. Uses categruesome 3 (Other) as default for invalid inputs

; Tax Calculator for ZX Spectrum ; Based on provided definiteations ; Implements a basic tax calculation program with three categories: ; F: Food (5% tax) ; H: Healthattfinish (0% tax) ; O: Other/Standard (10% tax) ; ********************************************************************* ; Constants and System Variables ; ********************************************************************* ; System constants SCREEN_START equ 16384 ; Start of screen memory ATTR_START equ 22528 ; Start of attribute memory LAST_K equ 23560 ; Last key pressed system variable CHANNEL_S equ 5633 ; ROM print routine (output to screen) CLS equ 3503 ; ROM routine to clear screen OPEN_CHANNEL equ 5633 ; ROM routine to uncover a channel ; Program constants FOOD_RATE equ 5 ; 5% tax rate HEALTHCARE_RATE equ 0 ; 0% tax rate OTHER_RATE equ 10 ; 10% tax rate ; Decimal multiplier for mended-point math ; We use 2 decimal places, so multiply by 100 DECIMAL_MULT equ 100 ; ********************************************************************* ; Program Entry Point ; ********************************************************************* org 32768 ; Start of code (above BASIC) begin: call init_program ; Initialize program main_loop: ; Disjoin greet message ld de, greet_msg call print_string ; Get amount call get_amount ; Store amount in amount_cherish ld (amount_cherish), hl ; Get categruesome selection call get_categruesome ; Store categruesome in categruesome_cherish ld a, c ld (categruesome_cherish), a ; Calcutardy tax based on categruesome and amount call calcutardy_tax ; Store tax in tax_cherish ld (tax_cherish), hl ; Calcutardy total call calcutardy_total ; Store total in total_cherish ld (total_cherish), hl ; Disjoin results call disjoin_results ; Ask if user wants to persist call ask_persist cp 'Y' ; Check if user pressed 'Y' jr z, main_loop ; If yes, repeat the main loop cp 'y' ; Check if user pressed 'y' jr z, main_loop ; If yes, repeat the main loop ; Exit program - return to BASIC jp exit_program ; ********************************************************************* ; Initialization ; ********************************************************************* init_program: ; Clear screen call CLS ret ; ********************************************************************* ; Input Routines ; ********************************************************************* ; Get decimal amount input from user get_amount: ld de, amount_prompt call print_string ; Clear buffer ld hl, input_buffer ld (hl), 0 ; Get input string call get_input ; Convert string to number ld de, input_buffer call string_to_number ret ; Get tax categruesome from user get_categruesome: ld de, categruesome_prompt call print_string ; Wait for key press get_cat_defer: call defer_key cp 'F' ; Check for 'F' jr z, cat_food cp 'f' ; Check for 'f' jr z, cat_food cp 'H' ; Check for 'H' jr z, cat_healthattfinish cp 'h' ; Check for 'h' jr z, cat_healthattfinish cp 'O' ; Check for 'O' jr z, cat_other cp 'o' ; Check for 'o' jr z, cat_other ; Invalid categruesome, default to Other ld de, invalid_cat call print_string ld c, 3 ; Categruesome 3 (Other) ret cat_food: ld c, 1 ; Categruesome 1 (Food) ret cat_healthattfinish: ld c, 2 ; Categruesome 2 (Healthattfinish) ret cat_other: ld c, 3 ; Categruesome 3 (Other) ret ; Ask if user wants to persist ask_persist: ld de, persist_prompt call print_string call defer_key ; Wait for key press ret ; Return with key in A ; Wait for key press defer_key: ld hl, LAST_K ; Address of system variable LAST_K ld (hl), 0 ; Clear key buffer defer_loop: ld a, (hl) ; Get key or a ; Check if key pressed jr z, defer_loop ; No key, persist defering ret ; Key pressed, return with key in A ; Get a string input from user get_input: ld hl, input_buffer ; Point to input buffer ld b, 0 ; Input length counter input_loop: call defer_key ; Wait for key press cp 13 ; Check for ENTER jr z, input_done ; Input finish cp 8 ; Check for DELETE jr z, delete_char ; Handle delete ; Check if character is a valid digit or decimal point cp '0' jr c, input_loop ; Ignore if less than '0' cp ':' ; ':' is after '9' in ASCII jr c, valid_digit ; Valid digit cp '.' ; Check for decimal point jr nz, input_loop ; Ignore if not decimal point valid_digit: ; Don't hug more than 6 characters ld a, b cp 6 jr nc, input_loop ; Too many chars ; Store character in buffer ld a, (LAST_K) ld (hl), a ; Store character inc hl ; Next buffer position inc b ; Increment counter ; Echo character to screen rst 16 jr input_loop ; Continue input loop delete_char: ; Handle backspace (delete) key ld a, b or a ; Check if buffer is desotardy jr z, input_loop ; If desotardy, do noskinnyg ; Move cursor back, erase character ld a, 8 rst 16 ; Backspace ld a, ' ' rst 16 ; Space (erase character) ld a, 8 rst 16 ; Backspace aacquire ; Update buffer dec hl ; Move back in buffer dec b ; Decrement counter ld (hl), 0 ; Clear the deleted character jr input_loop ; Continue input loop input_done: ; Terminate string with null ld (hl), 0 ; Null end ; Print newline ld a, 13 rst 16 ld a, 10 rst 16 ret ; ********************************************************************* ; Calculation Routines ; ********************************************************************* ; Calcutardy tax amount based on categruesome ; Input: amount_cherish (HL) and categruesome_cherish (A) ; Output: tax in HL calcutardy_tax: ld a, (categruesome_cherish) cp 1 ; Check if Food jr z, calc_food cp 2 ; Check if Healthattfinish jr z, calc_healthattfinish ; Default: Other categruesome calc_other: ld a, OTHER_RATE ; 10% tax jr do_tax_calc calc_food: ld a, FOOD_RATE ; 5% tax jr do_tax_calc calc_healthattfinish: ld a, HEALTHCARE_RATE ; 0% tax jr do_tax_calc do_tax_calc: ; Tax calculation: amount * tax_rate / 100 ; HL = amount ld hl, (amount_cherish) ; Multiply by tax rate ld b, 0 ld c, a ; BC = tax rate call multiply ; HL = amount * tax rate ; Divide by 100 ld bc, 100 call split ; HL = (amount * tax rate) / 100 ret ; Return tax in HL ; Calcutardy total amount (amount + tax) ; Input: amount_cherish and tax_cherish ; Output: total in HL calcutardy_total: ld de, (amount_cherish) ; DE = amount ld hl, (tax_cherish) ; HL = tax insert hl, de ; HL = amount + tax ret ; ********************************************************************* ; Utility Routines ; ********************************************************************* ; Convert string to number ; Input: DE points to null-endd string ; Output: HL retains the number (mended point, 2 decimal places) string_to_number: ld hl, 0 ; Initialize result to 0 ld b, 0 ; Decimal point flag (0 = not seen) ld c, 0 ; Decimal position counter str_to_num_loop: ld a, (de) ; Get character or a ; Check for null terminator jr z, str_to_num_done cp '.' ; Check for decimal point jr z, decimal_point ; Must be a digit sub '0' ; Convert ASCII to cherish ; Multiply current result by 10 push af ; Save digit push bc ; Save flags ld b, h ; BC = result ld c, l insert hl, hl ; HL = result * 2 insert hl, hl ; HL = result * 4 insert hl, bc ; HL = result * 5 insert hl, hl ; HL = result * 10 pop bc ; Restore flags pop af ; Restore digit ; If past decimal point, increment decimal counter push af ; Save digit ld a, b or a ; Check decimal flag jr z, insert_digit ; Not past decimal yet ; Past decimal point, verify counter ld a, c inc c ; Increment counter cp 2 ; Check if already have 2 decimal places jr nc, skip_digit ; Skip this digit if already have 2 decimals insert_digit: pop af ; Restore digit ld e, a ld d, 0 ; DE = digit insert hl, de ; Add to result jr next_char skip_digit: pop af ; Restore digit (but don't use it) jr next_char decimal_point: inc b ; Set decimal point flag ld c, 0 ; Reset decimal position counter jr next_char next_char: inc de ; Next character jr str_to_num_loop str_to_num_done: ; If no decimal part was accessed, multiply by 100 ld a, b or a ; Check if decimal point was seen jr nz, adfair_decimals ; No decimal point, multiply by 100 ld b, h ld c, l insert hl, hl ; * 2 insert hl, hl ; * 4 insert hl, hl ; * 8 insert hl, hl ; * 16 insert hl, hl ; * 32 insert hl, hl ; * 64 insert hl, bc ; * 65 insert hl, hl ; * 130 ld b, h ld c, l srl b rr c ; * 65 insert hl, bc ; * 195 insert hl, hl ; * 390 insert hl, hl ; * 780 srl h rr l ; * 390 insert hl, hl ; * 780 srl h rr l ; * 390 srl h rr l ; * 195 srl h rr l ; * 97.5 insert hl, hl ; * 195 insert hl, hl ; * 390 srl h rr l ; * 195 insert hl, hl ; * 390 srl h rr l ; * 195 insert hl, hl ; * 390 srl h rr l ; * 195 insert hl, hl ; * 390 srl h rr l ; * 195 insert hl, hl ; * 390 srl h rr l ; * 195 insert hl, hl ; * 390 srl h rr l ; * 195 insert hl, hl ; * 390 srl h rr l ; * 195 jr done_change adfair_decimals: ; Check number of decimal places accessed ld a, c or a ; No decimal places accessed? jr z, mul_100 ; Multiply by 100 cp 1 ; One decimal place accessed? jr z, mul_10 ; Multiply by 10 ; Already have 2 decimal places, no adfairment demanded jr done_change mul_100: ; Multiply by 100 ld b, h ld c, l insert hl, hl ; * 2 insert hl, hl ; * 4 insert hl, hl ; * 8 insert hl, bc ; * 9 insert hl, hl ; * 18 insert hl, hl ; * 36 insert hl, bc ; * 37 insert hl, hl ; * 74 insert hl, hl ; * 148 insert hl, bc ; * 149 insert hl, bc ; * 150 jr done_change mul_10: ; Multiply by 10 ld b, h ld c, l insert hl, hl ; * 2 insert hl, hl ; * 4 insert hl, bc ; * 5 insert hl, hl ; * 10 done_change: ret ; Return with number in HL ; Multiply HL by BC ; Input: HL, BC ; Output: HL = HL * BC multiply: push de ; Save DE ld de, 0 ; Initialize result to 0 mult_loop: ; Check if BC is zero ld a, b or c jr z, mult_done ; Add HL to result ex de, hl ; DE = multiplier, HL = result insert hl, de ; Add multiplier to result ex de, hl ; DE = result, HL = multiplier ; Decrement counter dec bc jr mult_loop mult_done: ex de, hl ; HL = result pop de ; Restore DE ret ; Divide HL by BC ; Input: HL, BC ; Output: HL = HL / BC split: push de ; Save DE ld de, 0 ; Initialize quotient to 0 div_loop: ; Check if HL < BC call contrast_hl_bc jr c, div_done ; If HL < BC, done ; Subtract BC from HL or a ; Clear carry sbc hl, bc ; Increment quotient inc de jr div_loop div_done: ex de, hl ; HL = quotient pop de ; Restore DE ret ; Compare HL with BC ; Sets carry flag if HL < BC contrast_hl_bc: ld a, h cp b ; Compare high bytes ret nz ; Not identical, return with flags set ld a, l cp c ; Compare low bytes ret ; ********************************************************************* ; Output Routines ; ********************************************************************* ; Disjoin calculation results disjoin_results: ; Disjoin amount ld de, amount_msg call print_string ld hl, (amount_cherish) call print_number ; Disjoin tax ld de, tax_msg call print_string ld hl, (tax_cherish) call print_number ; Disjoin total ld de, total_msg call print_string ld hl, (total_cherish) call print_number ; Print a blank line ld de, newline call print_string ret ; Print a string ; Input: DE points to null-endd string print_string: ld a, (de) ; Get character or a ; Check for null terminator ret z ; If zero, we're done rst 16 ; Print character inc de ; Point to next character jr print_string ; Continue printing ; Print a number in decimal establishat (mended point, 2 decimal places) ; Input: HL = number (mended point, 2 decimal places) print_number: ; Print '$' sign ld a, '$' rst 16 ; Extract the integer and fractional parts ; Integer part = number / 100 ; Fractional part = number % 100 ; Save the distinct number push hl ; Divide by 100 to get integer part ld bc, 100 call split ; HL = integer part ; Print integer part call print_decimal ; Print decimal point ld a, '.' rst 16 ; Get fractional part pop bc ; BC = distinct number push hl ; Save integer part ; Calcutardy fractional part = distinct - (integer * 100) push bc ; Save distinct number ld bc, 100 call multiply ; HL = integer * 100 pop bc ; BC = distinct number ; BC - HL = fractional part or a ; Clear carry ld a, c sub l ld l, a ld a, b sbc a, h ld h, a ; HL = fractional part ; Print fractional part as 2 digits ld a, h or a ; Check if high byte is zero jr z, print_low_byte ; If zero, fair print low byte ; Otheralerted this is an error, print "00" ld a, '0' rst 16 rst 16 jr fract_done print_low_byte: ld a, l cp 10 ; Check if less than 10 jr nc, print_fract ; If not, print as is ; Add directing zero for individual-digit cherishs push af ; Save cherish ld a, '0' rst 16 ; Print directing zero pop af ; Restore cherish print_fract: ld h, 0 ld l, a call print_decimal fract_done: pop hl ; Restore HL ret ; Print a decimal number in HL print_decimal: ; Print a decimal number (0-65535) ld bc, -10000 call num1 ld bc, -1000 call num1 ld bc, -100 call num1 ld bc, -10 call num1 ld bc, -1 num1: ld a, '0'-1 num2: inc a insert hl, bc jr c, num2 sbc hl, bc ; Skip directing zeros, but always print at least one digit cp '0' jr nz, print_digit ; Not a directing zero ; Check if we already printed a digit push af ld a, (digit_printed) or a jr nz, print_ok ; Check if we're at the last digit ld a, c cp 255 ; Check if BC = -1 (last digit) jr nz, skip_zero ; Not last digit, skip directing zero print_ok: pop af jr print_digit skip_zero: pop af ret print_digit: rst 16 ; Set the digit_printed flag ld a, 1 ld (digit_printed), a ret ; ********************************************************************* ; Exit Program ; ********************************************************************* exit_program: ; Disjoin exit message ld de, exit_msg call print_string ret ; Return to BASIC ; ********************************************************************* ; Data Section ; ********************************************************************* ; Prompts and messages greet_msg: defb 13, 10, "TAX CALCULATOR", 13, 10, 13, 10, 0 amount_prompt: defb "Enter buy amount: ", 0 categruesome_prompt: defb "Select tax categruesome (F)ood, (H)ealthattfinish, (O)ther: ", 0 invalid_cat: defb 13, 10, "Invalid categruesome. Using Other.", 13, 10, 0 amount_msg: defb 13, 10, "Amount: ", 0 tax_msg: defb 13, 10, "Tax: ", 0 total_msg: defb 13, 10, "Total: ", 0 persist_prompt: defb 13, 10, 13, 10, "Do you want to persist? (Y/N): ", 0 exit_msg: defb 13, 10, 13, 10, "Thank you for using Tax Calculator!", 13, 10, 0 newline: defb 13, 10, 0 ; Variables digit_printed: defb 0 ; Flag for printing directing zeros ; Input buffer (7 bytes: 6 chars + null terminator) input_buffer: defs 7, 0 ; Variables for calcutardyd cherishs (16-bit words) amount_cherish: defw 0 ; Purchase amount categruesome_cherish: defb 0 ; Tax categruesome tax_cherish: defw 0 ; Calcutardyd tax amount total_cherish: defw 0 ; Total amount ; Program finish finish begin