C++ program to demonstrate namespace

#include <iostream>
using namespace std;
namespace nm
{
class test
{
private:
int m;
public:
test(int a)
{
m=a;
}
void display()
{
cout<<"m= "<<m<<endl;
}
};
}
int main()
{
nm::test t1(200);
t1.display();

using namespace nm;
test t2(400);
t2.display();
}