Include Header File. In your C++ source file, include the header file using the #include directive. // Example: main.cpp #include “myheader.h” // Include the header file int main() { myFunction(); // ...

A C++ Crash Course on Object Oriented Programming with Qt Applications - AmericanEnglish/OOCPP. ... For brevity I will only include the header file code in this example. # include < iostream > # ...