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CPP Namespaces

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A namespace in CPP is used to define a scope in order to differentiate similar functions, classes, variables etc. to define the context in which names are defined for the same name available in different libraries.

Syntax: Defining Namespace

namespace namespace_name

{
// code declarations
}

 

Syntax: Calling the defined name

namespace_name  :: code;  // code could be variable or function.

 

Example:

#include <iostream>  
using namespace std;  
namespace str1 {    
void display() {   
cout<<"I am the First String!"<<endl;     	 
}    
}    
namespace str2  {    
void display() {   
cout<<"I am the Second String!"<<endl;   
}    
}   
int main()  
{  
str1::display();  
str2::display();  
return 0;  
}

Output

I am the First String!                                                                    
I am the Second String!