#include <iostream>
#include <cstdlib>
using namespace std;

// Put you function prototype (declarations) here.



double MPG ( double sizeoftank, double numberofmilest, double gasleftintank)
{


MPG=numberofmilest/(sizeoftank-gasleftintank);
return MPG;
}

system("PAUSE");

}

You need to at least write a main() program, that is the only way you will be able to test your mpg function.

You still need to call your function from main(). In main, simply initialise and assign three double variables and pass them into your function.

In main() something like this cout << mpg(d1, d2, d3) << " mpg.\n"; Note, d1, d2 & d3 are the three variables previously initialised and assigned.

We're not bothered about user input at this stage, the whole point is merely to test that your functions works. I can tell you that your function is correct but you need to test it for yourself.