How to change the value of a pointer variable C++ source code example

Compiler: Visual C++ Express Edition 2005

Compiled on Platform: Windows 2003 Server Standard Edition

Header file: Standard

Additional project setting: Set project to be compiled as C++

Project -> your_project_name Properties -> Configuration Properties -> C/C++ -> Advanced -> Compiled As: Compiled as C++ Code (/TP)

Other info: none

To do: Changing the pointer variable value in C++ programming

To show: How to change the value of a pointer variable in C++ programming

// a program that changes the value of a pointer variable

#include <iostream>

using namespace std;

void main(void)

{

// declare and initialize two float variables

double var1 = 58.98;

double var2 = 70.44;

// declare a float pointer variable

double *ptr_var;

// make ptr_var point to variable var1

ptr_var = &var1;

// prints 58.98

cout<<"\nThe first value is(var1) "<<*ptr_var;

cout<<"\nThe address of the first data is "<<ptr_var<<"\n";

cout<<"\nThen let the same pointer (*ptr_var)";

cout<<"\npoint to other address...\n";

// make ptr_var point to variable var2

ptr_var = &var2;

// prints 70.44

cout<<"\nThe second value is(var2) "<<*ptr_var;

cout<<"\nThe address of the second data is "<<ptr_var<<endl;

return;

}

Output example:

The first value is(var1) 58.98

The address of the first data is 0012FF5C

Then let the same pointer (*ptr_var)

point to other address...

The second value is(var2) 70.44

The address of the second data is 0012FF4C

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