指针定义

int *i;   //定义一个整型数字的指针变量 i

int p = 34;   

i = &p;

printf("i value = %d ,address = %p",*i,i);

return0; 

i value = 34 ,address = 0x7fff5fbff854

 

#include <stdio.h>

#include <ctype.h>  // 包括字符处理函数

void swap(int *i,int *p);

int main(int argc, const char * argv[])

{

    int i = 5;

    int p = 10;

    printf("i = %d, p = %d\n",i,p);

    

    swap(&i, &p);

    printf("i = %d, p = %d",i,p);

    return 0;

}

 

void swap(int *i, int *p)

{

    int temp = *i;

    *i = *p;

    *p = temp;

}

 

i = 5, p = 10

i = 10, p = 5