程序代码：

#include<stdio.h>
void swap(int a, int b)
{
    int temp;
    temp = a;
    a = b;
    b = temp;
    printf("%d %d\n", a, b); 
}
int main()
{
    int a, b;
    a = 3;
    b = 10;
    swap(a, b);
    getchar();
    return 0;
}