I have to create a small program which contains a header file, and an implementation file where the body's of the functions are written and another cpp file to have the main method. I'm totally new to OOP and I have this confusion.
I have declared double variables in the class as private. Now I want to have a function to accept values and set those values to these variables. function body is written in a separate cpp file. When I write it to accept values as parameters and assign them to those variables, compiler gives errors saying those variables are not declared.