C Program to Calculate the Factorial of a number using Function.

    In this example, we will calculate the factorial of a number using function. Here we have used functions with Arguments and return value to perform this operation. We have declared a user-defined function fact which is called in the main function when printing the result.

What is a Factorial of  a Number?
    The factorial of a number is the product of all positive integers less than, equal to n. Factorial is denoted by the symbol '!'. Formula of factorial is n!=n x (n-1)!

For example:

6!= 6 x 5 x 4 x 3 x 2 x1

   = 720

PROGRAM TO CALCULATE THE FACTORIAL OF A NUMBER USING FUNCTION

#include<stdio.h>

#include<conio.h>

int fact(int);

void main()

{

    int n;

    printf("Enter the number : ");

    scanf("%d",&n);

    printf("Factorial of %d is : %d",n,fact(n));

    getch();

}

int fact(int b)

{

    int i,f=1;

    for(i=1;i<=b;i++)

    {

        f=f*i;

    }

    return(f);

}

OUTPUT OF FACTORIAL OF A NUMBER USING FUNCTION.

  Enter the number : 6

  Factorial of 6 is : 720

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