4) Factorial
Factorial of n is the product of all positive descending integers. Factorial of n is denoted by n!.
There are many ways to write the factorial program in c language. Let's see the 2 ways to write the factorial program.
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Factorial Program using loop
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Factorial Program using recursion
Write a c program to print factorial of a number.
Input: 5
Output: 120
Input: 6
Output: 720
Factorial Program using loop
Let's see the factorial Program using loop.
#include<stdio.h>
int main()
{
int i,fact=1,number;
printf("Enter a number: ");
scanf("%d",&number);
for(i=1;i<=number;i++){
fact=fact*i;
}
printf("Factorial of %d is: %d",number,fact);
return 0;
}
Factorial Program using recursion in C
Let's see the factorial program in c using recursion.
#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 is %ld\n", number, fact);
return 0;
}