Sabotenderizer Sabotenderizer - 4 months ago 40
C# Question

Calculating factorials in C# using loops

This is what I have so far:

namespace factorials
class Program
static void Main(string[] args)
int number;

Console.WriteLine("What non-negative integer do you want to factorial?");
while (!int.TryParse(Console.ReadLine(), out number))
Console.WriteLine("Please enter a whole number only");
calculate(ref number);
} while (number >= 0);
Console.WriteLine("Please enter a non-negative number");

static void calculate(ref int number)
int factorial;
int counter;

for (counter = number; counter <= number; counter++)
factorial = number * number;
Console.WriteLine("The factorial of {0} is {1}", number, factorial);


Right now it just gives me the square of the numbers, not the factorial of them. How do I make it repeat the number of times as the input so it results in a factorial?

Also I am not sure if it's necessary to limit the program to non-negative integers only but if I want to that part is just ending the program right there instead of looping back to the beginning.


Your loop assigns the square of the number to the result in a loop, and exits right away. You need to change it so that the result is repeatedly multiplied by numbers from 1 to N, inclusive.

Assign 1 to factorial, and multiply it by counter inthe loop:

factorial *= counter;

Don't forget to start your counter at 1.