In this tutorial, we will learn to write the program to find the factorial of numbers using the C programming language. Here we are going to follow an iterative approach.
Please follow this article for factorial program in C using recursion
Before moving forward let’s understand
What is Factorial of a number?
Factorial of a whole number ‘n’ is the product of that number ‘n’ with its every whole number in descending order till 1.
For example
Factorial of 5 is 5*4*3*2*1 = 120
And factorial of 5 can be written as 5!.
Note: To store the largest output we are using long long data type. Long long takes double memory as compared to single long.
There are multiple ways to write the program in C to calculate the factorial of the whole number.
In this tutorial, we will learn to write using
1). Using For Loop
2). Using Function
1). Factorial Program in C of a given number using for Loop
#include<stdio.h> int main() { int i,num,factorial=1; printf("Enter a whole number to find Factorial = "); scanf("%d",&num); for(i=1;i<=num;i++){ factorial=factorial*i; } printf("Factorial of %d is: %d",num,factorial); return 0; }
Output

2). Factorial Program in C using Function and While Loop
#include<stdio.h> int fact(int num){ int i=1,fact=1; while(i<=num){ fact*=i; i++; } return fact; } int main() { int i,num,factorial=1; printf("Enter a whole number to find Factorial = "); scanf("%d",&num); printf("Factorial of %d is: %d",num,fact(num)); return 0; }
Output

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