Зміст курсу
C# Basics
C# Basics
Practicing Method with Parameters
In this challenge you need to create a new method called factorial
which will have one parameter called n
of type int
. It should calculate the factorial of the passed value n
and output the result.
The blueprint of the program is given, fill the missing details to complete the program:
main
using System; namespace ConsoleApp { internal class Program { static void factorial(___) { if(n == 0) { Console.WriteLine(___); } else if (n > 0) { int result = 1; for (int i = 2; i <= ___; i++) { ___ } Console.WriteLine(___); } else { Console.WriteLine(___); } } static void Main(string[] args) { factorial(-1); factorial(0); factorial(5); } } }
- We had done a factorial related exercise in one of the previous sections but to recap, the factorial of a number is the product of all the numbers up till that number.
For-example the factorial of
5
is1 x 2 x 3 x 4 x 5
which is120
, similarly the factorial of4
is24
. There are two additional rules:
- Factorial of
0
is1
; - Factorial of a negative number is
undefined
so it should outputundefined
;
- For solving the task, following the following steps:
- Fill in the blank for the
factorial
method with appropriate parameter definition. It expects an integer. Figure out what should be the name of the parameter by reading the method's inner code; - If the passed argument is
0
, it should show a fixed output which is mentioned in the hints; - The loop should continue up till (including the number) the passed integer. The
result
variable should be updated with the product of itself with the loop variable. In short:result *= i
; - If the input number is negative (invalid), it should output "undefined".
main
using System; namespace ConsoleApp { internal class Program { static void factorial(int n) { if(n == 0) { Console.WriteLine(1); } else if (n > 0) { int result = 1; for (int i = 2; i <= n; i++) { result *= i; } Console.WriteLine(result); } else { Console.WriteLine("undefined"); } } static void Main(string[] args) { factorial(-1); factorial(0); factorial(5); } } }
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