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| 1 | .data | |
| 2 | msg: .string "If result is 1 Matrikelnummer is valid otherwise invalid. Result: %d\n" | |
| 3 | # number: abcdefg, valid if (a * 9 + b * 7 + c * 3 + d * 9 + e * 7 + f * 3) mod 10 = g | |
| 4 | ||
| 5 | .text | |
| 6 | .global main | |
| 7 | ||
| 8 | main: | |
| 9 | - | movl $611813,%eax |
| 9 | + | movl $1611813,%eax |
| 10 | movl $10, %ebx | |
| 11 | movl $0, %ecx | |
| 12 | movl $0, %edx | |
| 13 | movl $0, %edi | |
| 14 | ||
| 15 | cdq | |
| 16 | idivl %ebx | |
| 17 | movl %edx, %edi # edi = g (1st digit) | |
| 18 | ||
| 19 | cdq | |
| 20 | idivl %ebx | |
| 21 | imull $3, %edx # f*3 | |
| 22 | movl %edx, %ecx # ecx = f*3 (2nd digit) | |
| 23 | ||
| 24 | cdq | |
| 25 | idivl %ebx | |
| 26 | imull $7, %edx # e*7 | |
| 27 | addl %edx, %ecx # ecx = f*3 + e*7 (3rd digit) | |
| 28 | ||
| 29 | cdq | |
| 30 | idivl %ebx | |
| 31 | imull $9, %edx # d*9 | |
| 32 | addl %edx, %ecx # ecx = f*3 + e*7 + d*9 (4th digit) | |
| 33 | ||
| 34 | cdq | |
| 35 | idivl %ebx | |
| 36 | imull $3, %edx # c*3 | |
| 37 | addl %edx, %ecx # ecx = f*3 + e*7 + d*9 + c*3 (5th digit) | |
| 38 | ||
| 39 | cdq | |
| 40 | idivl %ebx | |
| 41 | imull $7, %edx # b*7 | |
| 42 | addl %edx, %ecx # ecx = f*3 + e*7 + d*9 + c*3 + b*7 (6th digit) | |
| 43 | ||
| 44 | cdq | |
| 45 | idivl %ebx | |
| 46 | imull $9, %edx # a*9 | |
| 47 | addl %edx, %ecx # ecx = f*3 + e*7 + d*9 + c*3 + b*7 + a*9 (7th) | |
| 48 | ||
| 49 | movl %ecx, %eax | |
| 50 | cdq | |
| 51 | idivl %ebx | |
| 52 | ||
| 53 | cmpl %edi, %edx | |
| 54 | je .valid | |
| 55 | movl $0, %eax | |
| 56 | jmp .invalid | |
| 57 | ||
| 58 | .valid: | |
| 59 | movl $1, %eax | |
| 60 | ||
| 61 | .invalid: | |
| 62 | ||
| 63 | pushl %eax | |
| 64 | pushl $msg | |
| 65 | call printf | |
| 66 | ||
| 67 | movl $0, %eax | |
| 68 | int $0x80 |
