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Recap - Simple Calculator

Part of the Fundamentals section of Coddy's GDScript journey. Lesson 28 of 92.

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Challenge

Easy

Build a small calculator. The variables n1, n2 and op are read for you on the first three lines (do not change them), and op holds one of "+", "-", "*" or "/".

Set result based on op:

  • "+": n1 + n2
  • "-": n1 - n2
  • "*": n1 * n2
  • "/": n1 divided by n2, keeping the decimal part

Write all four cases: the tests try each operator. result is a float, so it always prints with a decimal point. For example, for 12, 34 and "+" the output is:

result = 46.0

and for 7, 2 and "/" it is:

result = 3.5

Try it yourself

extends Node

func _ready():
	var n1 := int(OS.read_string_from_stdin()) # Don't change this line
	var n2 := int(OS.read_string_from_stdin()) # Don't change this line
	var op := OS.read_string_from_stdin() # Don't change this line
	var result: float = 0.0
	# Write your code below

	# Don't change the line below
	print("result = ", result)

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