Question

Translate the following C program to Pep/9 assembly language.

#include <stdio.h>

const int limit = 5;

int main() {

int number;

scanf("%d",&number);

while (number < limit){

number++;

printf("%d",number);

}

return 0;

}

Answer 1

limit:
.long 5
.LC0:
.string "%d"
main:
push rbp
mov rbp, rsp
sub rsp, 16
lea rax, [rbp-4]
mov rsi, rax
mov edi, OFFSET FLAT:.LC0
mov eax, 0
call __isoc99_scanf
jmp .L2
.L3:
mov eax, DWORD PTR [rbp-4]
add eax, 1
mov DWORD PTR [rbp-4], eax
mov eax, DWORD PTR [rbp-4]
mov esi, eax
mov edi, OFFSET FLAT:.LC0
mov eax, 0
call printf
.L2:
mov eax, DWORD PTR [rbp-4]
mov edx, 5
cmp eax, edx
jl .L3
mov eax, 0
leave
ret

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