Concept of function in C?

Jan 12 • Resources • 2090 Views • 6 Comments on Concept of function in C?

quest1 Define function?

A function is a module or block of program code which deals with a particular task. Making functions is a way

of isolating one block of code from other independent blocks of code.

quest 2Methods of passing in functions?

There are two ways to pass parameters to a function:

  • Pass by Value: mechanism is used when you don’t want to change the value of passedparamters. When parameters are passed by value then functions in C create copies of the passed in variables

    and do required processing on these copied variables.

  • Pass by Reference mechanism is used when you want a function to do the changes in passedparameters and reflect those changes back to the calling function. In this case only addresses of the

    variables are passed to a function so that function can work directly over the addresses.

quest 3 Example of pass by value?

#include <stdio.h>
void swap( int p1, int p2 );

int main()
{
   int a = 10;
   int b = 20;

   printf("Before: Value of a = %d and value of b = %dn", a, b );
   swap( a, b );
   printf("After: Value of a = %d and value of b = %dn", a, b );
}

void swap( int p1, int p2 )
{
    int t;

    t = p2;
    p2 = p1;
    p1 = t;
   printf("Value of a (p1) = %d and value of b(p2) = %dn", p1, p2 );
}

quest 4 Example of pass by reference?

#include <stdio.h>

void swap( int p1, int p2 );

int main()
{
   int a = 10;
   int b = 20;

   printf("Before: Value of a = %d and value of b = %dn", a, b );
   swap( a, b );
   printf("After: Value of a = %d and value of b = %dn", a, b );
}

void swap( int p1, int p2 )
{
    int t;

    t = p2;
    p2 = p1;
    p1 = t;
   printf("Value of a (p1) = %d and value of b(p2) = %dn", p1, p2 );
}

quest 5 concept of return in functions?

A return keyword is used to return a value and datatype of the returned value is specified before the

name of function. In this case function returns total which is int type. If a function does not

return a value then void keyword can be used as return value.

quest 6 what is function defination?

When a function is defined at any place in the program then it is called function definition. At the time of  definition of a function actual logic is implemented with-in the function.

quest 7 Some features of function in c?

1) Reusability of Code : Means Once a Code has Developed then we can use that Code

any Time.

2) Remove Redundancy: Means a user doesn’t need to Write Code Again and Again.

3) Decrease Complexity: Means a Large program will be Stored in the Two or More

Functions. So that this will makes easy for a user to understand that Code.

 

Tell us Your Queries, Suggestions and Feedback

Your email address will not be published.

6 Responses to Concept of function in C?

  1. Kishlay Verma says:

    Concept of functions is very much important for understanding C programming language. This is the building block for any software project.

  2. Hardik Sanghvi says:

    Function implementation and its reusability has helped C to be one of most accepted language

  3. Ritika says:

    Functions are very important part of C programming & help in constructing complex programs.

  4. sakshi chaudhary says:

    C language has different no of functions and they are used differently at various points…this article gives the idea of the usage of the functions properly in the programming

  5. Saurabh Singh says:

    as all we know that C is a basic language..check it and make you aware about different function used in C..

  6. Siddhant Tripathi says:

    The write up deals with the varying uses of the functions available in C!

« »