C 指针交换两个数

#include<stdio.h>
void interchange(int * u, int * v);
int main(void)
{
int x = 5, y = 10;
printf("Orginally x = %d and y = %d.\n",x,y);
interchange(&x,&y);
printf("Now x = %d and y = %d.\n",x,y);
return 0;
}
void interchange(int * u, int * v)
{
int temp;
temp = *u;
*u = *v;
*v = temp;
}