what all using namespace std in c++ code example
Example 1: using namespace std in c++
#include <iostream>
using namespace std;
int main()
{
cout << "Hello World";
system("pause");
return 0;
}
Example 2: what is namespace in c++
//namespace is a declarative region to provide scope for identifiers
#include <bits/stdc++.h>
using namespace std; //including namespace std for cin and cout
//my custom namespace for variables and functions
namespace abc
{
void fun()
{
cout<<"Hello world"<<endl;
}
int x=10;
}
using namespace abc;
int main()
{
cout<<10;
fun();
return 0;
}