c语言变量的交换 

 1 #include<stdio.h>
 2 void swap1(int a,int b);    //利用异或交换变量的值,值传递
 3 void swap2(int* a,int* b);    //利用异或交换变量的值,地址传递，这里用指针*
 4 
 5 
 6 void swap1(int a,int b)    /*深拷贝值传递*/
 7 {
 8     a = a ^ b;
 9     b = a ^ b;
10     a = a ^ b;
11 }
12 
13 void swap2(int* a,int* b)    /*浅拷贝地址传递*/
14 {
15     *a = *a ^ *b;
16     *b = *a ^ *b;
17     *a = *a ^ *b;
18 }
19 
20 int main(void)
21 {
22     int a1 = 5,b1 = 10;
23     printf("swap1交换前：地址：a1 = %p,b1 = %p..值：a1 = %d,b1 = %d\n",a1,b1,a1,b1);
24     swap1(a1,b1);
25     printf("swap1交换后：地址：a1 = %p,b1 = %p..值：a1 = %d,b1 = %d\n",a1,b1,a1,b1);
26     int a2 = 5,b2 = 10;
27     printf("swap2交换前：地址：a2 = %p,b2 = %p..值：a2 = %d,b2 = %d\n",a2,b2,a2,b2);
28     swap2(&a2,&b2);
29     printf("swap2交换后：地址：a2 = %p,b2 = %p..值：a2 = %d,b2 = %d\n",a2,b2,a2,b2);
30     return 0;
31 }

 

posted @ 2020-03-30 21:59  Axuanup  阅读(539)  评论(0)    收藏  举报