关于指针2

/*

**test18.cpp : Defines the entry point for the console application.

**系统winXP SP3 32位.

**关于指针2

*/

#include "stdafx.h"

#include "iostream.h"

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

{

    int* piNum = new int[100];

    printf("sizeof(int) = %d\n",sizeof(int));    //4

    cout<<"value piNum is: "<<(unsigned int)piNum<

    cout<<"value piNum is: "<

    cout<<"address piNum is: "<<&piNum<

    piNum += 50;  //这里编译器写为piNum += 50 * sizeof(int),这里是将其后面指向4*50个位置

    cout<<"value piNum is: "<<(unsigned int)piNum<

    cout<<"value piNum is: "<

    cout<<"address piNum is: "<<&piNum<

    piNum++;      //即为piNum = piNum + 1

    cout<<"value piNum is: "<<(unsigned int)piNum<

    cout<<"value piNum is: "<

    cout<<"address piNum is: "<<&piNum<

    return 0;

}

Tips1：编译器会把指针解释为unsigned int类型

Tips2：指针的++或--即为指向其序列的前一个或后一个元素，与指针本身加减某个具体数字一样的道理。