Namespaces in C++ - Sanfoundry

This C++ Program which demonstrates the use of namespaces. The program creates two namespaces with a variable of same name defined in each of them but with different data type. The functions functionOne( ) and functionTwo( ) take an integer as an input and save in the variable “val”. The values of “val” are printed in the context of both namespaces.

Here is source code of the C++ program which demonstrates the use of namespaces. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C++ Program to Demonstrate the use of Namespaces

```
 */
```
```
#include <iostream>
```
```
 
```
```
namespace One
```
```
{
```
```
    int val;
```
```
}
```
```
namespace Two
```
```
{
```
```
    char val;
```
```
}
```
```
 
```
```
void functionOne(void)
```
```
{
```
```
    using namespace One;
```

    /* Variable val is defined in context of namespace One */

    std::cout << "Enter the value of val : ";

```
    std::cin >> val;
```

    std::cout << "functionOne()" << endl

```
              << "Value of val : "
```
```
              << val << endl;
```
```
}
```
```
 
```
```
void functionTwo(void)
```
```
{
```
```
    using namespace Two;
```

    /* Variable val is defined in context of namespace Two */

    std::cout << "Enter the value of val : ";

```
    std::cin >> val;
```

    std::cout << "functionTwo()" << endl

```
              << "Value of val : "
```
```
              << val << endl;
```
```
}
```
```
 
```
```
int main()
```
```
{
```
```
    functionOne();
```
```
    functionTwo();
```
```
    return 0;    
```
```
}
```

$ g++ main.cpp
$ ./a.out
Enter the value of val : 5
functionOne()
Value of val : 5
Enter the value of val : 5
functionTwo()
Value of val : &#x2663;

Sanfoundry Global Education & Learning Series – 1000 C++ Programs.

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