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Recap - Factorial

Part of the Fundamentals section of Coddy's GDScript journey. Lesson 47 of 92.

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Challenge

Easy

The factorial of a whole number n is the product of all the whole numbers from 1 to n. It is written n!:

  • 3! is 1 x 2 x 3 = 6
  • 5! is 1 x 2 x 3 x 4 x 5 = 120
  • 1! is 1, and 0! is also 1

Write a program that reads a whole number n (0 or more) and prints its factorial. Print only the number.

For the input 5, the output is:

120

Try it yourself

extends Node

func _ready():
	# Read n, then print n! (the factorial of n)
	pass

All lessons in Fundamentals

1Introduction

The LanguageHello World!CommentsBasic Program Structure

4Operators Part 1

Arithmetic OperatorsInteger DivisionModulo OperatorArithmetic ShortcutsRecap - Simple MathComparison Operators

7Basic IO

OutputOutput With VariablesString FormattingInputCastRecap - Till 120Recap - True or False

10Functions

Declare a FunctionArgumentsReturnReturn TypesRecap - Sigma FunctionRecap - Validation FunctionDefault Values

13Iterating Over Arrays

Iterating Over ElementsIterating With IndexesIterating Over Strings Part 1Iterating Over Strings Part 2

16Daily Expense Tracker

Project OverviewExit The ProgramProject lessonAdd ExpenseProject lessonView All ExpensesProject lessonTotal And AverageProject lessonClear AllProject lessonHandling ErrorsProject lesson

2Variables Part 1

NumbersStringBooleanEmpty VariablesNaming Conventions

5Operators Part 2

Logical Operators Part 1Logical Operators Part 2Recap - Simple LogicLogical Operators Part 3Ternary Operator

8Bill Split Calculator

Welcome MessageGetting InputProject lessonCalculating The Tip And TotalProject lessonSplitting The BillProject lessonFormatted OutputProject lesson

11FizzBuzz with a Twist

Game OverviewThe FizzBuzz FunctionProject lessonLooping The NumbersProject lessonAdding The TwistProject lesson

14Arrays Advanced

Array SlicingSequence OperatorsMembershipSort And Reverse

17Final Challenges

Flat Asterisk PyramidPattern FinderWhat To Buy

3Variables Part 2

Type DeclarationType InferenceConstantsRecap - Initialize VariablesType Casting

6Decision Making

If StatementIf - ElseRecap - Simple CalculatorNested If - ElseMatch Statement

9Loops

For LoopWhile LoopBreakContinueRecap - FactorialThe Range FunctionNested LoopRecap - Dynamic Input

12Arrays Basics

Declaring an ArrayAccessing Array ElementsModifying ArraysArray MethodsRecap - Product ArrayRecap - Reversed ArrayTyped Arrays

15Dictionaries

Creating DictionariesAccessing ValuesModifying DictionariesDictionary MethodsIterating Over DictionariesRecap - Inventory Dictionary

Practice on your own: Online GDScript compiler