C Tutorial

C Tutorial C Language Environment Setup Execution flow of C program C printf and Scanf C Data type C Token Variable in C Operators in C Comments in C Escape Sequence in C C – Storage Classes C Decision control statement Loop Statement in C Break, continue and goto statement in C Type Casting in C Function in C Recursion in C String in C C Array Pointer in C Dynamic memory allocation C –Structure Nested Structure in C Union in C File Handling in C C pre-processor Static Function In C Sizeof In C Selection Sort In C Scope Of Variables In C Runtime Vs Compile Time In C Random Access Lseek In C Queue Implementation In C Pseudo Code In C Prototype In C Pointer To Pointer In C Pointer Arithmetic In C Passing Array To Function In C Null Character In C Merge Sort In C Macros In C Library Functions In C Memory Leak In C Int In C Goto And Labels In C Fibonacci Series In C Fflush In C Derived Data Types In C Data Types In C Const Vs Volatile In C Character Set In C Character Class Tests In C Calloc In C C Pointers Arrays In C Include In C Clrscr In C C Vs Java String Literals In C Types Of Pointers In C Variables In C Volatile In C Why C Is A Middle Level Language Infix To Postfix Program In C Ceil function in C LCM of two numbers in C Quick sort in C Static in C function pointer as argument in C Top Array Keywords in C Add two numbers using the function in C Armstrong program in C using function Array, Declaring Arrays and Array Initialization Limitations of Inline Function in C Merge and Merge sort with example in C Do-While Loop in C For Loop in C While-Loop in C Difference between while and do-while loop in C Array Of Structures in C Data Structures And Algorithms in C Types Of Structures In C How to Avoid Structure Padding in C Use of Structure in C Do WHILE LOOP in C Programming Examples For Loop in C Programming Examples Entry Control Loop in C Exit control loop in C Infinite loop in C Nested loop in C pow() function in C String Handling functions in C Prime Number code in C Factorial Program in C using For Loop Factorial Program in C Using While Loop Fibonacci Series in C Using For Loop Fibonacci series in C using while loop Prime Number Program in C using for Loop While Loop in C programming examples Built-in functions in C Assert() Function C vs Java Strings Call Back Function in Embedded C Else If Ladder fgets() function Ftell() Function getc() function getch() function gets() function Heap Sort Nested if-else statement Pi() Function Positioning of file Write() function abs() function in C Attributes in C C program to find factorial of a number using Recursion Ferror() in c fopen() function in C Fibonacci series program in C using Recursion Formatted Input and output function in C Snake Game in C User Defined Functions in C Beep() function in C Cbrt() function in C Hook() function in C Isalnum() function in C C Program to find the Roots of a Quadratic Equation C Switch Statements Difference between rand() and srand() function in C Difference between while and for loop in C Doubly Linked list in C Example of Iteration in C How to use atoi() function in C How to use floor() function in C How to use sine() function in C How to use Typedef Struct in C Integer Promotions in C C Program Swap Numbers in cyclic order Using Call by Reference C Program to Find Largest Number Using Dynamic Memory Allocation C Program to Find the Largest Number using Ternary Operator C/C++ Program to Find the Size of int, float, double and char Find the Largest Three Distinct Elements in an Array using C/C++ Loop Questions in C Modulus on Negative Numbers in C Multiplication table program in C using For loop Nested Loops in C Programming Examples C Program for Mean and Median of an Unsorted Array Results of Comparison Operations in C and C++ Reverse a Stack using Recursion in C Simple hash() function in C strcat() Function in C Sum of N numbers in C using For loop Use of free() function in C Write a program that produces different results in C and C++ C Function Argument and Return Values Keywords in C Bank management system in C Calendar application in C Floor() Function in C Free() Function in C How to delete a file in C How to move a text in C Remove an element from an array in C Unformatted input() and output() function in C What are linker and loader in C SJF Scheduling Program in C Socket Programming in C Structure in C Tower of Hanoi in C Union Program in C Variable Declaration in C What is Linked List in C While Loop Syntax in C fork() in C GCD program in C Branching Statements in C Comma Operator in C Control statement in C Double Specifier in C How to create a binary file in C Long int in C Palindrome Number in C Pure Virtual Function in C Run Time Polymorphism in C Types of Array in C Types of Function in C What is a buffer in C What is required in each C Program Associativity of Operators in C Bit Stuffing Program in C Actual and Formal Parameters Addition of two Numbers in C Advantages of function in C Arithmetic Progression Program in C Binomial Coefficient Program in C Difference between Array and List in C Diffie-Hellman Algorithm in C How to convert a number to words in C How to convert a string to hexadecimal in C Difference between If and Switch Statement in C C and C++ Binary Files C program that does not Suspend when Ctrl+Z is Pressed Different ways to Declare the Variable as Constant in C Range of Int in C C Program to find the size of a File FIFO Example in the C Language For loop in C Programming GCD program of two numbers in C GPA Calculator in C How to Calculate Time Complexity in C How to include graphics.h in C How to measure time taken by a function in C How to return a Pointer from a Function in C What is the main in C Addition of Matrix in C Booleans in C C Program for Extended Euclidean algorithms C Program of Fencing the Ground Ceil and Floor in C Compound Interest Program in C Displaying Array in C Distance Vector Routing Protocol Program in c Dos.h Header File in C Language DSA Program in C Explain the two-way selection in C Fee Management System in C File Operations in C Malloc function in C Multiplication Table in C Simple Programs in C Language tolower() Function in C Type Conversion in the C Why does sizeof(x++) not Increment x in C

Advantages of function in C

What is a Function in C?

A function is a group of statements that work together to complete a certain goal. Every c program contains one or more than one functions. Because it is the starting point of your C code, where your program is performed, the main() function is a must for the C programming language.

Huge C programs are broken down into fundamental building elements known as C functions. A C function is a collection of instructions surrounded by the symbol "" that carry out a particular task in a C program. Actually, a C program is created by the collection of these functions.

Why Functions are used in C?

A program's fundamental building elements are C functions. All C programs use functions to enhance their capacity to be reused, understood, and maintained.

Syntax for the functions in C

The syntax for declaring the function in c is given as

return-typefunction_name(arguments)
{
Block of statements;
Return statement;
}

Explanation:

  • Optional return types, arguments, and return statements
  • In practice, it is unnecessary to specify the return statement anytime a function returns a value. In this instance, a warning message with the subject line "function should return a value" will appear.
  • Every time the function returns a value, collecting the value is not required

Classification of Functions

Functions are classified into two types

  1. Library function
  2. User-defined function

1. Library function

These library functions are present in each and every header that can be used in a program. some of the header files given below

  • scanf()
  • printf()
  • gets()
  • puts()

2. User-defined function

The user is required to create user-defined functions while developing a program and it minimizes the code and decreases the complexity of a large programme.

Function Features

There are types of features. They are

  1. Function definition
  2. Function call
  3. Function declaration

1. Function definition

The actual statements that must be executed are contained there. The most crucial component is the one over which the function has control. Here the function returns only one value.

Syntax:

return-type function_name(arguments)
{
function body;
}

2. Function call

Throughout the program, functions can be invoked from anywhere. Function declaration and function call cannot have different parameter lists. The number of functions that must be sent must match the number indicated in the function declaration.

Syntax:

function_name(arguments);

3. Function declaration

A function must be declared globally in a C programme so that the compiler is aware of the function name, function parameters, and return type.

return-type function name(arguments) is the syntax.

Function Categories

A function may or may not accept an argument. It might or might not provide any benefit in return.These facts lead to the conclusion that function calls have four different characteristics.

  • without return value and without parameters
  • with a return value and without parameters
  • with parameters and without return value
  • with parameters and with return value

Advantages of Functions

  • We can avoid rewriting application code by using functions.
  • We can create an application in module structure by using functions.
  • By using the function, program development will be simplified.
  • When an application is developed in module format, it is simple to trace and debug the programs.
  • We may track the program's logic implementation by using the functions.
  • Code reuse is the function's primary goal.
  • A c program is made up of several functions.
  • We can call any other function from any other function.
  • The process of compilation will always go top to bottom.
  • The main will be the sole variable used during execution, from beginning to end.
  • To avoid a compilation problem during implementation, we must use a forward declaration, or prototype, when using a function that was defined later.
  • Function declaration calls for the specification of the return type, function name, and parameter type information.
  • The initial line of a function definition is referred to as the function declarator or function header.
  • If a function never returns any values, then specify void as the return type.
  • Whenever a function returns a value during implementation, the return type must be specified as the return value type. i.e., a return statement of the same type as the value we are returning is necessary.
  • The function's default parameter type is void, and its default return type is an int.