Question

1) Translate the following C program to Pep/9 assembly language. Please attach screenshot of Pep/9 simulator running the program.

#include <stdio.h.>

int main() {

int numitms,j,data,sum;

scanf("%d", &numitms);

sum=0;

for (j=1;j<=numitms;j++) {

scanf("%d", &data);

sum+=data;

}

printf("sum: %d\n",sum);

return0;

}

Answer 1

Converted Code:

.LC0:
        .string "%d"
.LC1:
        .string "sum: %d\n"
main:
        push    rbp
        mov     rbp, rsp
        sub     rsp, 16
        lea     rax, [rbp-12]
        mov     rsi, rax
        mov     edi, OFFSET FLAT:.LC0
        mov     eax, 0
        call    __isoc99_scanf
        mov     DWORD PTR [rbp-8], 0
        mov     DWORD PTR [rbp-4], 1
        jmp     .L2
.L3:
        lea     rax, [rbp-16]
        mov     rsi, rax
        mov     edi, OFFSET FLAT:.LC0
        mov     eax, 0
        call    __isoc99_scanf
        mov     eax, DWORD PTR [rbp-16]
        add     DWORD PTR [rbp-8], eax
        add     DWORD PTR [rbp-4], 1
.L2:
        mov     eax, DWORD PTR [rbp-12]
        cmp     DWORD PTR [rbp-4], eax
        jle     .L3
        mov     eax, DWORD PTR [rbp-8]
        mov     esi, eax
        mov     edi, OFFSET FLAT:.LC1
        mov     eax, 0
        call    printf
        mov     eax, 0
        leave
        ret

Screenshots:

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