An example of a function in a program is a sum function. Here’s a simple implementation: define a function named sum that takes two arguments. Call it using variables a and b: int a = 5; int b ...

A common task for a program is to read data from a file. To read from a text file in C, you will need to open a file stream using the fopen() function. Once a file stream has been opened, you can then ...

By default, C makes every function defined in a file callable (visible) from functions defined in any other file. Similarly, all data items other than those local to a function are accessible from ...