Function in C


In c, we can divide a large program into the basic building blocks known as function. The function contains the set of programming statements enclosed by {}. A function can be called multiple times to provide reusability and modularity to the C program. In other words, we can say that the collection of functions creates a program. The function is also known as procedureor subroutinein other programming languages.

Function Aspects


There are three aspects of a C function.

  • Function declaration : A function must be declared globally in a c program to tell the compiler about the function name, function parameters, and return type.

  • Function call : Function can be called from anywhere in the program. The parameter list must not differ in function calling and function declaration. We must pass the same number of functions as it is declared in the function declaration.

  • Function definition : It contains the actual statements which are to be executed. It is the most important aspect to which the control comes when the function is called. Here, we must notice that only one value can be returned from the function.

Types of function


There are two types of functions in C programming

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

  • 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.

    1. Return Type

    2. Non-Return Type

Different aspects of function calling


  • function without arguments and without return value

  • function without arguments and with return value

  • function with arguments and without return value

  • function with arguments and with return value


List of Programs


Sample Programs


Switch Case in C


Conditional Operators in C


Goto Statement in C


While Loop Example Programs


Looping Statements in C

For Loop Example Programs


Array Examples in C

One Dimensional Array


Two Dimensional Array in C


String Example Programs in C


Functions Example Programs in C


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