Printf("The Addition is: %d\n", add(x, y)) Int add(int x, int y) // function prototype Let’s have a look at simple example and then we will break down program to understand. When I say that the function returns a value, I mean that the function can be used in the same manner as a variable would be. ![]() Just like a blueprint, the prototype gives basic structural information: it tells the compiler what the function will return, when the function will be called, as well as what arguments the function can be passed. Functions are made for code reusability and for saving time and space. Functions that a programmer writes will generally require a prototype. The functions which are defined by the user at the time of writing program. These are already declared and defined in C libraries. You just need to include appropriate header files to use these functions. The functions which are defined by C library example printf(), scanf(), strcat() etc. ![]() Types of Functions in C Library Functions There are two types of functions Standard Library Functions and User Defined Functions. 3.1 Example: Function using call by valueĭividing complex problem into small components makes program easy to understand and use.
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