各位老铁帮忙看下，我看了好几遍都没找出什么问题只要一运行电脑就会显示windows已停止工作
#include<stdio.h>
int main()
{
    int m,n,i=0,j=0,a=1,b,z=1;
    scanf("%d,%d",&m,&n);
    while(z)
    {   
        if((m%i==0)&&(n%i==0))
        {
            if(i>a)
            {
                a=i;                        
                if((a>=m)||(b>=n))
                {
                    printf("%d",a);
                    z=0;
                }
                else
                {
                    i=i+1;
                }
            }
        }
    }
    return 0;
}

if((a>=m)||(b>=n))这里的b是a打错