注册不久，发个初级编程水平的帖子，笑纳！！！
#include <stdio.h>
main()
{
int a,b,num1,num2,temp;
printf("please input two numbers:\n");
scanf("%d,%d",&num1,&num2);
if(num1<num2)//交换两个数，使大数放在num1上
{
temp=num1;
num1=num2;
num2=temp;
}
a=num1;b=num2;
while(b!=0)//利用辗除法，直到b为0为止
{
temp=a%b;
a=b;
b=temp;
}
printf("gongyueshu:%d\n",a);
printf("gongbeishu:%d\n",num1*num2/a);
}