Last Updated: 5 Feb, 2021
Factorial of a Number
Easy
Asked in companies
Write a program to find the factorial of a number.
Factorial of n is:
n! = n * (n-1) * (n-2) * (n-3)....* 1
Output the factorial of 'n'. If it does not exist, output 'Error'.
Input format :
The only line of input contains a single integer.
Output format :
The only line of output prints the Factorial of the number or "Error" if it doesn't exist.
Constraints:
-10 <= n <= 12
Approaches
- This can be done using an if-else-if ladder to check for negative,0, and positive numbers.
- If the input is a positive number use a while loop to multiply n with n-1, n-2…1 and get the desired output.
- This can be done using an if-else conditional statement to check for negative, and positive numbers.
- If the input is a positive number use a for loop to multiply n with n-1, n-2…1 and get the desired output.
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