1 #include<stdio.h>
 2 void swap(int *x, int *y)
 3 {
 4     int temp = 0;
 5     temp = *x;
 6     *x = *y;
 7     *y = temp;
 8     return;
 9 }
10 
11 int main(int argc, const char *argv[])
12 {
13     int a = 0, b = 0;//定义需要传给形参，给形参赋值的变量
14     printf("plese input two number:");
15     scanf("%d%d",&a,&b);
16     printf("a = %d,b = %d\n",a , b);
17     swap(&a, &b);
18     
19     printf("a = %d,b = %d\n",a , b);    
20     return 0;
21 }