- <div class="blockcode"><blockquote>#include <stdio.h>
- void swap(int *p1,int *p2);
- void swap1(int x,int y);
- void swap2(int *p1,int *p2);
- int main(int argc, const char * argv[])
- {
- // 定义变量
- int a = 3,b = 4;
- int *p1 = &a,*p2 = &b;
- swap(p1, p2);
- //swap1(3, 4);
- //swap2(p1, p2);
- printf("a=%d,b=%d\n",a,b);
- return 0;
- }
- void swap(int *p1,int *p2)
- {
- //注意,正解!
- int temp;
- temp = *p1;
- *p1 = *p2;
- *p2 = temp;
- }
- void swap1(int x,int y)
- {
- //此处实际上是形参变量x,y的值交换,与实参无关
- int temp;
- temp = x;
- x = y;
- y = temp;
- }
- void swap2(int *p1,int *p2)
- {
- //相当于形参的地址进行了交换,与实参无关
- int *temp;
- temp = p1;
- p1 = p2;
- p2 = temp;
- }
复制代码
当当当当,就如上代码所示咯,注释也很清楚,写下来希望自己谨记,也给大家做个参考!
|
|