# include <stdio.h>
# include <stdlib.h>
int main ()
{
    int m,n;
    printf("Enter two integers:");
    scanf("%d %d",&m,&n);   
    do{
    m == n;
    n == m%n;
    }while (n!=0);   
    printf("Greatest common divisor:%d",m);  
    system("pause");
    return 0;
}
   

  新手，真的C语言觉得很难~~~