Skip to main content

Inroduction To Function In C language

Functions:
*It is block of code that together perform a task.
*In C programming at least one function is present Is main().
*WITHOUT main we can make any program in c lnguage.
*We Can Devide Our Code In Diffrent Function By Two Part.
1)Fuction Declaration:
2)Function Definition:
Now We Will Understand Abouut These Fuction Parts.
1)Function Declration:-
*A function declaration tells the compiler about a
 function name and how to callthe function.
*Fuction Declration Has Following Syntax.
 return_type function_name( parameters list );
return_type:=datatype which return by function
Function name:-Name Of The Function Which You Want
Paremeter List:-It Is List Of Argument Which Have To Pass.
For Example:-
int min(int x,int y); or int min(int ,int);
*Function declaration is required when you define a function in
 one source file all that function in another file.
2)Fuction Definition:-
*It The Acrual Body Of Function. It Means The code is written in
 This section Which Task Have To Perform:
Syntax For function Definition-
return_type function_name( parameter list )
{
body of the function
}
The return_type,function_name, Parameters Is Defined Above.
*Function Body:-The function body contains a collection of statements
 that define what the function does.
Example (Function definition)
Given Example Is The Source Code For A Fuction Called min().This Function
Take Two Parameters X,Y(integers) And It Returns minimum Of X,y
/* function returning the min between two numbers */
int max(int X, int Y)
{
/* local variable declaration */
int result;
if (X < Y)
result = X;
else
result = Y;
return result;
}
Calling A Function:-
*When a program calls a function, the program control is transferred
 to the called function
*A called function performs a defined task and when its return statement
 is executed or when its function-ending closing brace is reached, it then
 returns program control back to the main program.
*For Calling A Fumction We Need To pass the required parameters along with
 the function name, and if the function returns a value, then you can store
 the returned value.
Example Program:-
#include <stdio.h>
int max(int n1, int n2);    //function declaration 
int main ()
{
/* local variable definition */
int x = 10;
int y = 20;
int ret;
/* calling a function to get max value */
ret = min(x, y);
printf( "Min value is = %d\n", ret );
return 0;
}
int min(int n1, int n2)  //FUNCTION DEFINITION
{
/* local variable declaration */
int result;
if (n1 < n2)
result = n1;
else
result = n2;
return result;
}
Output Of This Program Is Given In Picture:-

                                        - : Thanks A Lot :-

Labels:

Comments

Post a Comment

Popular posts from this blog

Calling Method Of Function In C Language

Calling Method In C Language:- As We Already See That Any Function has Some Arguments Or void If We Use Variable As Argument Then It Is Called FORMAL PARAMETERS. *Formal parameters behave like other local variables inside the function  and are created upon entry into the function and destroyed upon exit. In C Language there are two ways in which arguments can be passed to a function:- 1)Call by value:-      (using value) 2)Call by reference:-  (using pointer) Now We Will See One By One These Arguments By Taking Suitable Example: 1)Call by value:-  *In This Method actual value copies to formal parameter: *Due To That changes made to the parameter inside the function  have no effect on the argument. This will cleared by following example:- Example Program:- //in this program we swap two variable using third variable: #include <stdio.h> /* function declaration */ void swapping(int a, int b); int main () { /* local variable definition */ int x =...
Post a Comment
Read more

Types Of Array In C language

Two Dimensional Array :- * It Is The Combination Of Two One Dimensional Array * It Is Used To Implement Matrix Operation . *A two-dimensional array can be considered as a table which  will have 'a' number of rows and'b'number of columns. Declaration Of Two Dimensional Array:-   data_type Array_name [size of row][size of column]; For Example:- int matrix[3][4]; in above example we will store a matrix of 3*3. This Will Cleared From Following Figure:- *It can be represented a[i][j].where i and j represents  row and column respectively. Initialization Of Two Dimensional Array:- let us consider an array "float a[3][3]"then it will be initialized float a[3][3]={                {1.2,2.3,4.3} //initializers for row indexed by 0                {2.1,2.2,2.3} //initializers for row indexed by 1                {3.1,3.4,3.6} //initializers for row indexed by 2 ...
Post a Comment
Read more

Introduction To "C" Language

Basic Introduction:- Dennis M. Ritchie to develop the UNIX operating system at Bell Labs. C was originally first implemented on the DEC PDP-11 computer in 1972. In 1978, Brian Kernighan and Dennis Ritchie produced the first publicly available description of C, now known as the K&R standard. The UNIX operating system, the C compiler, and essentially all UNIX application programs have been written in C. C has now become a widely used professional language for various reasons: 1. Easy to learn 2. Structured language 3. It produces efficient programs 4. It can handle low-level activities 5. It can be compiled on a variety of computer platforms IMPORTENT FACTS ABOUT C:- *) C was invented to write an operating system called UNIX. a) C is a successor of B language which was introduced around the early    1970s. b) The language was formalized in 1988 by the American National Standard    Institute (ANSI). c) The UNIX OS was totally written in C. d) Today C is the most wid...
3 comments
Read more