小弟我想用在C中调用汇编完成a+b的功能，但是不知道有关问题出在哪儿了，求指点

#include <stdio.h>
#include <stdlib.h>

char str1[] = "%d %d\n";
char str2[] = "%d\n";
int a = 0,b = 1;

int main()
{
    _asm
    {
        mov eax,offset a
        push eax
        mov eax,offset b
        push eax
        mov eax,offset str2
        call scanf
        pop ebx
        pop eax
        mov a,eax
        pop eax
        mov b,eax

        mov eax,a
        push eax
        mov eax,b
        push eax
        mov eax,offset str1
        push eax
        call printf

        pop ebx
        pop ebx
        pop ebx
    }
    return 0;
}

#include <stdio.h>
#include <stdlib.h>
int main()
{
    char str1[] = "%d %d";
    char str2[] = "%d\n";
    int a = 0,b = 1;
    __asm
    {
        pushad
        lea eax, a
        push eax
        lea eax, b
        push eax
        lea eax, str1
        push eax
        call scanf_s
        add esp, 0xC
        mov eax, a
        add eax, b
        push eax
        lea eax, str2
        push eax
        call printf_s
        add esp, 0x8
        popad
    }
    system("pause");
    return 0;
}