c语言使用指针交换数值

练习题:将两个int类型数值交换

#include <stdio.h>
 
void swap(int*,int*);
 
int main(void){
 
    int bin = , hex = 0x5f1043;
 
    swap(&bin,&hex);
 
    printf("%d %d\n",bin,hex);    
 
    return ;
}
 
void swap(int *p1, int *p2)
{
    int tmp = *p1;
    *p1 = *p2;
    *p2 =tmp;
}

练习题:将两个字符串交换

#include <stdio.h>
 
void swap(char**,char**);
 
int main(void){
 
    char *sz1 ="World\0";
    char *sz2 = "Hello\0";
 
    swap(&sz1,&sz2);
 
    printf("%s %s\n",sz1,sz2);
 
    return ;
}
 
void swap(char **sz1, char **sz2)
{
    char *tmp = *sz1;
    *sz1 = *sz2;
    *sz2 = tmp;
}