Programming in C++, 2nd Edition

The Standard Namespace std 835

21.20 Write a program to specify alias to existing namespace.

#include<iostream>

using namespace std;

namespace number

{

int n;

void show()

{cout<<“\n n=”<<n;}

}

int main()

{

namespace num=number;

num::n=200;

number::show();

return 0;

}

OUTPUT

n=200

Explanation: In the above program, the namespace number is defined. In the function main(),

its alias name is created as follows:

Namespace num=number;

The num is another name given to the namespace number. The member of the namespace

number can be accessed using both the names, that is, num and number. The variable n is ac-

cessed using the name num, and the function ...