C Program To Find Factorial of Number
Learn How To Find Factorial of Number in C Programming Language. It is important that we should know about How A For Loop Works before getting further with the C Program Code. This Code is described with an Explanation of Factorial Program in C Language. We have used Recursion method as well as the While and For Loops in the following Factorial Programs.
What is a Factorial of a Number?
A Factorial for a Non-Negative Integer is the Product of all the Positive Integers Less than or Equal to that Number. The Factorial Notation is used in Combinatorics, Permutations, Algebra and other Mathematical Analysis.
Example
5! = 5 * 4 * 3 * 2 * 1 = 120
One interesting thing to note here is that the value of 0! = 1.
Must Read: C Program To Find Factorial of Large Numbers
Method 1: Calculate Factorial of Number in C with While Loop
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | #include<stdio.h> void main() { int num, count, fact = 1; printf("\nEnter a Number:\t"); scanf("%d", &num); count = num; while(count >= 1) { fact = fact * count; count--; } printf("\nFactorial of %d is %d\n", num, fact); } |
Must Read: C Program To Display Fibonacci Series
Method 2: C Program To Find Factorial of a Number using For Loop
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | #include<stdio.h> int main() { int num, count, fact = 1; printf("\nEnter a Number:\n"); scanf("%d", &num); for(count = num; count >= 1; count--) { fact = fact * count; } printf("\nFactorial of %d is %d\n", num, fact); return 0; } |
Must Read: C Program To Find Greatest Common Divisor of Two Numbers
Method 3: C Program To Calculate Factorial using Recursion Method
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | #include<stdio.h> int factorial_recursion(int x); int main() { int var, check; printf("\nEnter a Number:\t"); scanf("%d", &var); check = factorial_recursion(var); if(res == check) { printf("\nFactorial of %d is %d\n", var, check); } else { printf("\nFactorial of %d is %d\n", var, check); } return 0; } int factorial_recursion(int m) { if(m == 1) return m; else return (m*factorial_recursion(m - 1)); } |
Must Read: C Program To Calculate Value of nPr in Probability
Output
If you have any compilation errors or doubts in this C Program To Find Factorial of Number , let us know about in the Comment Section below. Find more information about the Factorial of a Number in this Wikipedia article.
Thanks for so many ways to solve factorial program in c programming. Helped to match differences between for and while loops.
You’re welcome Dipak! Our main aim was to make the readers understand Factorial of a Number C Program effectively using comparison!!
I finally learnt how to convert a For Loop into a While Loop in C Programming.
Can we use separate funtion to write factorial program in C language?
Can we make a library function for factorial of a number c program which cam be used by including header files?
Can we find Factorial of a very large integer number using the same code above?
No. A large integer will require a datatype having larger range than just an int. This code is sufficient only for finding factorial of a normal number.
Please provide Factorial of Large Numbers in C Programming.
This program for factorial can contain one additional if loop. Since, the factorial of 1! is 1 and the factorial of 0! is 1, it needs to be implemented in this factorial code too.
if(n == 0 || n == 1)
{
fact = 1;
}
Best explanation of the factorial of a number in C programming. This has cleared my concepts and especially the loops in C.