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 Dynamic Memory Allocation in C Armstrong Number in C Assignment Operator Program in C Banker’s Algorithm in C Binary Search in C with Best and Worst Time Complexity Caesar Cipher Program in C Call by Value and Call by Reference in C Conditional Operator in C CRC Program in C Deadlock Detection Program in C Decimal to Binary in C Difference between If Else and Nested If Else in C Difference between Pre-increment and Post-increment in C Difference between Scope and Lifetime in C Evaluation of Arithmetic Expression in C Explain the Increment and Decrement Operators in C Fseek Function in C Functions in C How to Find Square Free Numbers in C Length of an Array Function in C OpenGL in C Projects on C language in 2023 Purpose of a Function Prototype in C Stdio.h in C Two-Dimensional array in C What is String Comparison in C
Functions in C
2023-03-10 17:55:15

Functions in C

What is function?

Functions are defined as the set of announcements which take inputs, perform operations and provide results. The operation of a function only performs when the function gets called. They accept arguments or values. Due to the presence of function, developers do not need to write the same code again and again. When an argument is passed to a function, the value of every argument is calculated before being passed to that function. Generally, a calling function asked a called function to perform the task when the task is successfully completed the call function reports back to the calling function. Functions are one of the most important terms used in computer science.

Functions in C

There are two types of functions in C language, that are user defined functions and library functions. Both of these functions are important in C language. User defined functions means which are defined by the users and library functions are those which are built in functions of programming language included in header files.

Creation of Functions

Functions can be defined as follows:

Return_type function_name (parameters)
{
//function’s body
}
  1. Function_name: As the heading defines, we have to define the function name but it should not be identical. They are known as function_name.
  2. Arguments: It specifies the values which are passed when the function get called. Arguments plays an important role in defining a functions.
  3. Return_type: Functions required return type because it always starts with the return type. Void is also used as the return type in functions. Every function required a return type that’s it is one of the most important term of function definition or declaration.

Types of Functions

Functions are divided in two categories. User defined and library functions both functions are one of the most important functions those are used in every programming language whether it is C, C++, Java, Python, C# etc.

  1. User defined functions: These types of functions are defined or declared by the user itself so that’s why they are known as user defined functions. They are also known as tailor made functions. These functions are updated according to the requirement of the programmer. We all know that this type is not included in the header file of the programming but 90% of the developers require building their own function which is known as user defined function for performing the specific task which is not performed by the library function or a built in function of C language.
  2. Library functions: These types of functions are also known as built in functions which are included in header files of the particular programming language. Compiler package that already presents contains library functions. They have advantage over user defined functions that there is no need to define the library functions because they are already built. Examples of library functions are pow(), sqrt (), strcmp (), strcpy () etc. Library functions are also as important as user defined functions. These types of function are also used by most of the developers and programmers of C language.

Advantages of User defined Functions

  1. As we know that they are defined by the user so, they can be redesign according to the requirement of programmer.
  2. The code of these functions are transformable in other programs.
  3. They are easy to maintain and recognize the working of these functions.

Advantages of Library Functions

  1. These are easy to understand and improved for efficient performance.
  2. These are suitable as they always work.
  3. It saves time that’s why they are better than user defined functions.

Function with arguments and return values

In the C language which was developed by Dennis Ritchie in the year 1972 which is most advanced type of programming language that time until C++ was discovered in 1983 by Bjarne Strostrup, function is called with the parameters or without the parameters and return values. Sometimes, they may not return values to the calling functions. They are the most important terms of function because most of them whether user defined or library functions.

Difference between Argument and Parameters

Arguments

Arguments are known as the values that are proceed with the function at the time when the functions are called. They are allocated to the variables in the definition of the function which is called. Arguments are one of the most important terms of all time included in the function of C language.

  1. Arguments are also known as the actual parameters.
  2. When we call each argument, it is always allocated to the parameter in the function definition.
  3. During the function, calling the values that are passed are known as arguments.
  4. They are used to send values from calling function to the destination or receiving function.

Parameters

Parameters are known as local variables. Variables are the type of containers which are used to store the values whether it is an integer, float or character. Which are defined when the function is created. Local variables are used to collect the arguments that are proceed at the time of function call. These type of parameters with the function sample used at the time of function execution. They are also known as formal parameters or we can say formal arguments.

  1. Parameters are local variables so that’s why getting the allocated value of arguments when the function is called.
  2. Values which are declared at the time of function sample, known as parameters.
  3. They are used in function header of called function to collect the values from the arguments. This is the most important difference between the parameter and the argument.