有关指针的执行效果

#include<iostream.h>
void main()
{

 int nNumber;
 int *pPointer;
 nNumber=15;
 pPointer=&nNumber;

 cout<<"nNumber="<<nNumber<<endl;
 cout<<"&nNumber="<<&nNumber<<endl;
 cout<<"pPoniter="<<pPointer<<endl;
 cout<<"*pPointer="<<*pPointer<<endl;
 cout<<"&pPointer="<<&pPointer<<endl;

 cout<<" "<<endl;
 *pPointer=25;

 cout<<"nNumber="<<nNumber<<endl;
}

 

 

 动态分配内存的指针

 

#include <iostream.h>

int *pPointer;

void SomeFunction()
{
      // 让指针指向一个新的整型
      pPointer = new int;
      *pPointer = 25;
}

void main()
{
      SomeFunction(); //为pPointer赋值
      cout<<"Value of *pPointer: "<<*pPointer<<endl;

      delete pPointer;
}　

 

最后行输出表达 该变量内存已被回收了。

 

作为指向数组的指针，传递数组值： 

#include <iostream.h>

void main()

{

      int Array[3];

      Array[0] = 10;

      Array[1] = 20;

      Array[2] = 30;

 

     for(int i=0;i<3;i++)

{

       int *pArray;

  pArray=&Array[i];   

 cout<<"pArray points to the value %d\n"<<*pArray<<endl;

}

}