C语言程序设计编程和解析过程

供参考：

#include<stdio.h>

int main()
{
    int a,b,num1,num2,temp;
    scanf("%d,%d",&num1,&num2);
    if(num1>num2)
    {
        temp = num1;
        num1 = num2;
        num2 = temp;
    }
    a=num1;b=num2;
    while(b!=0)
    {
        temp = b%a;
        a = b;
        b = temp;
    }
    printf("%d,%d",a,num1*num2/a);
}

if(num1 < num2)
temp = a%b;