WAP to use header file with double quote.

//program to understand header file with double quote
#include "iostream"  //header file enclosed inside double quote
#include"stdlib"     // header file for system("cls")
using namespace std;
int main()
{

    cout << "Hello world!" << endl; // cout object with insertion operator/put to operator(<<)
    cout<<"this is second line"<<endl;
    return 0;
}