Types of Functions in C Language

Categories: C language

There are two types of functions in C programming:

1. Library Functions: are the functions which are declared in the C header files such as scanf(), printf(), gets(), puts(), ceil(), floor() etc.

2. User-defined functions: are the functions which are created by the C programmer, so that he/she can use it many times. It reduces the complexity of a big program and optimizes the code.


Return Value

A C function may or may not return a value from the function. If you don't have to return any value from the function, use void for the return type.

Let's see a simple example of C function that doesn't return any value from the function.

Example without return value:


void hello(){  

printf("hello c");  

}  

If you want to return any value from the function, you need to use any data type such as int, long, char, etc. The return type depends on the value to be returned from the function.

Let's see a simple example of C function that returns int value from the function.


Different aspects of function calling

A function may or may not accept any argument. It may or may not return any value. Based on these facts, There are four different aspects of function calls.


1. function without arguments and without return value

2. function without arguments and with return value

3. function with arguments and without return value

4. function with arguments and with return value


Example for Function without argument and return value

Example 1

#include<stdio.h>  

void printName();  

void main ()  

{  

    printf("Hello ");  

    printName();  

}  

void printName()  

{  

    printf("Javatpoint");  

}  

Output

Hello Javatpoint

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