C Program to Calculate the Factorial of a number using Function

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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