C Programming Code Examples C > Miscellaneous Code Examples Program to Create Your Own Header File in C Programming Program to Create Your Own Header File in C Programming In this Code write only function definition as you write in General C Program Save Above Code with [.h ] Extension . Let name of our header file be myhead [ myhead.h ] Compile Code if required. #include<stdio.h> #include"myhead.h" void main() { int number1 = 10, number2 = 10, number3; number3 = add(number1, number2); printf("Addition of Two numbers : %d", number3); }