程序代码：

#include<stdio.h>
int main()
{
    int m,n,a,b,t,k;
    printf("2gezhengzhengshu:");
    scanf("%d,%d",&m,&n);
    if(m>n) t=n,k=m;
    else t=m,k=n;
    for(a=t;a>=1;a--)
    {
        if(m%a==0&&n%a==0) break;
        printf("yueshu:%d\n",a);
    }
    for(b=k;b>=k;b++)
    {
        if(b%m==0&&b%n==0) break;
        printf("yinshu:%d\n",b);
    }
    return 0;
}