'foo' was not declared in this scope c++

Question

I\'m just learning c++ (first day looking at it since I took a 1 week summer camp years ago)

I was converting a program I\'m working on in Java to C++:

Answer 1

In C++, your source files are usually parsed from top to bottom in a single pass, so any variable or function must be declared before they can be used. There are some exceptions to this, like when defining functions inline in a class definition, but that's not the case for your code.

Either move the definition of integrate above the one for getSkewNormal, or add a forward declaration above getSkewNormal:

double integrate (double start, double stop, int numSteps, Evaluatable evalObj);

The same applies for sum.