How to output signed variable

Question

How do I print signed value of my variable? For example:

int main()
{
    int variable_name = 2;
    cout<<variable_name<<endl;
}

I want this code to print +2, not just 2. And I don't want to use such construction:

cout<<"+"<<variable_name<<endl;

Answer 1

std::showpos is what you're looking for:

http://www.cplusplus.com/reference/ios/showpos/