double integer variable in another function

[1vf9z8AR]

suppose i define r=2 in a function g().how do i display twice the value of r in my main()?

[dhayden]

You use r in the return value of g:

#include <iostream>

int g()
{
    int r=2;
    return 2*r;
}

int
main()
{
    std::cout << g() << '\n';
}