Recap - Sigma Function

Part of the Fundamentals section of Coddy's GDScript journey. Lesson 55 of 92.

Challenge

Easy

Write a function named sigma with one int parameter n. It returns the sum of all the whole numbers from 1 to n, both included.

For example, sigma(5) returns 15, because 1 + 2 + 3 + 4 + 5 = 15.

The tests call sigma() themselves and check the value it returns. Do not call it, and do not print anything. The file needs only the function: no extends Node and no _ready().

Try it yourself

func sigma(n: int):
	# Write code here
	pass

All lessons in Fundamentals

1Introduction

The Language Hello World!Comments Basic Program Structure

4Operators Part 1

Arithmetic Operators Integer Division Modulo Operator Arithmetic Shortcuts Recap - Simple Math Comparison Operators

7Basic IO

Output Output With Variables String Formatting Input Cast Recap - Till 120 Recap - True or False

10Functions

Declare a Function Arguments Return Return TypesRecap - Sigma FunctionRecap - Validation Function Default Values

13Iterating Over Arrays

Iterating Over Elements Iterating With Indexes Iterating Over Strings Part 1 Iterating Over Strings Part 2

16Daily Expense Tracker

Project Overview Exit The Program

2Variables Part 1

Numbers String Boolean Empty Variables Naming Conventions

5Operators Part 2

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

8Bill Split Calculator

Welcome Message Getting Input

Calculating The Tip And Total

Splitting The Bill

Formatted Output

11FizzBuzz with a Twist

Game Overview The FizzBuzz Function

Looping The Numbers

Adding The Twist

14Arrays Advanced

Array Slicing Sequence Operators Membership Sort And Reverse

17Final Challenges

Flat Asterisk Pyramid Pattern Finder What To Buy

Practice on your own: Online GDScript compiler