编写程序，输入两个数，交换它们的值，并输出交换后的数；
#include"stdio.h"
void main()
{
    int a,b,temp;
    printf("please enter two int\n");
    scanf("&d%d",&a,&b);
    printf("before changed a=%d b=%d\n",a,b);
    temp=a;
    a=b;
    b=temp;
    printf("after changed a=%d b=%d\n",a,b);
}

谢谢