functuion in c language

 

Functions :

• Functions are used to divide a large C program into smaller pieces.
• Function can be called multiple or several times to provide reusability and modularity to the C program.
• Functions are also called as procedure or subroutines.
• It is a piece of code to accomplish certain operation

Advantages of Functions :

• We can avoid rewriting same logic or code through functions.
• We can divide the work among programmers using functions.
• We can easily debug or can find bugs in any program using functions.

Function Aspects :

There are 3 aspects of function :-

1. Declaration
2. Definition
3. Call

 there two type of function 

1. library function

2. user define function 

in this all doubt is clear 

#include<stdio.h>

int sum ( int a , int b)

{

   return a+b;

}

int printstar( int n )

    

{

   char i;

   

   for (int  i = 0; i < 7; i++)

   { 

       printf("%c\n",'*');

   }

   

   

    

   

}

int takenumber()

{   

    int i;

    printf(" enter any num\n");

    scanf("%d",&i);

    return i;

}

int main(int argc, char const *argv[])

{

    int a, b, c ,d;

    a = 4;

    b = 5;

    c = sum (a , b);

    printstar(7);

    d = takenumber();

    printf("the sum is %d\n", c);

   printf(" the entered num is %d", d);

    return 0;

}