Function:

A function is a set of statements that perform a specific task in response to a message.

In C language, the functions can be categorized in the following categories:

1. Single-level functions.
2. Multiple-level functions.

     Explain :-

Single-level functions.

#include<stdio.h>

void main()

{

printf(“Hello Dennis Ritchie”);

}

Multiple-level functions.

#include<stdio.h>

void ff()

{

printf(“Hello Dennis Ritchie\n”);

}

void main()

{

printf(“Welcome to C”);

ff();

}

Explane:-

‘void ff()’   -- is a programmer-defined function that can be independently called by ant other function. So, ‘ff()’ function called by ‘main()’ function.

‘\n’            -- is used for place the cursor to the new line.

Therefore the output will be :-

                   Hello Dennis Ritchie

                   Welcome to C