【汇编语言实战】输入2个整数求最大公约数

//辗转相除法
#include <stdio.h>
int main()
{
  int a,b;
  scanf("%d %d",&a,&b);
  while(a-b!=0)
  {
  if(a>b)
  {
    a=a-b;
  }
  else
  {
    b=b-a;
  }
  }
  printf("%d",a);
}

include irvine32.inc
.data
a dword ?
b dword ?
.code
main proc
call readint
mov a,eax
call readint
mov b,eax
mov eax,a
mov ebx,b
func:
cmp eax,ebx
jne compare ;如果不相等就跳转到compare，否则直接output输出
output:
call writeint
exit
compare:
jge jianfa ;如果a>b，则进行a-b
sub ebx,eax ;否则进行b-a
jmp func
jianfa:
sub eax,ebx
jmp func
main endp
end main