Thread: Need help!

cout, cin, and endl are in the std namespace, and you haven't specified that they are. There are two ways to do this. The first way is to specify it manually with the scope resolution operator( :: ) like so:

Code:

std::cout <<"whatever" <<std::endl;

The second(and usually preferred) method is to use the entire std namespace with a using statement:

Code:

#include <iostream>

using namespace std;

int main( )
{
	cout <<"whatever" <<endl;
}

The using statement prevents you from having to put std:: in front of the objects

Code:

 #include <iostream>
 
 using namespace std;
 
 int main()
   {
 
    int n1, n2, sum;
    cout << "Give the first number:" << endl;
    cin	>> n1;
    cout << "Give the second number:" << endl;
    cin	>> n2;
 
    sum  =  n1 + n2;
 
    cout  << "The result is...:" << sum << endl;
 
    return 0;
   }

The namespace issue has been explained. The reason why you need to do sum= n1 +n2 after the values have been read from the user is, that C or C++ are no logical languages. sum= n1 +n2 is not a definition but a command that is only performed once with the result saved to sum. So you have to do things in the right order.
You also forgot a "<<" operator between "The result is...:" and sum.

Thanks for the help guys..but when i am trying to run the program, it terminates without giving the result..? only asks for the 2 numbers...
i am using Dev-C++ compiler v5