Program for Factorial Using Recursion
Factorial
We will write a C program for calculate the factorial and the number will be entered by the user. This will help to understand the basic structure of programming. In this program , we will display the factorial of given number easily by using proper syntax and algorithms.
Working of Program :
In the program, we will require some numbers from the user to display the factorial of given numbers.
Important Note :
To calculate the factorial, factorial is used for exponential function in power series.
- Symbol of factorial is ! and value of 0! is 1.
Problem 1
Write a program to calculate factorial of given numbers.
- Firstly, we have to enter the numbers.
- Then print the factorial.
Code
#include<stdio.h>
long int multiplyNumbers (int n);
int main ()
{
int n;
printf ("Enter a positive integer = ");
scanf ("%d", &n);
printf ("Factorial of %d = %ld", n, multiplyNumbers (n));
return 0;
}
long int multiplyNumbers (int n)
{
if (n >= 1)
return n * multiplyNumbers (n - 1);
else
return 1;
}
Output
Enter a positive integer = 5 Factorial of 5 = 120
Note:
In the following program we will display the factorial of given numbers.
Problem 2
Write a program to calculate the factorial.
- Firstly, we have to enter the number.
- Then print the factorial.
Code
#include<stdio.h>
long factorial (int n)
{
if (n == 0)
return 1;
else
return (n * factorial (n - 1));
}
void main ()
{
int number;
long fact;
printf ("Enter a number = ");
scanf ("%d", &number);
fact = factorial (number);
printf ("Factorial of %d = %ld\n", number, fact);
return 0;
}
Output
Enter a number = 6 Factorial of 6 = 720
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