我想用在C中调用汇编完成a+b的功能，但是不知道问题出在哪儿了，求指点

[sjjwind]

#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;
}

[sjjwind]

初学汇编，有很多问题，还望大家不吝指点，代码怎么写更好希望大家指出，谢谢

[Dreadnought]

#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;
}

[sjjwind]

非常感谢！