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Recap - Simple Calculator

Part of the Fundamentals section of Coddy's Ruby journey — lesson 23 of 88.

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Challenge

Easy

You are provided with the following variables:

operator = "*"
num1 = 12
num2 = 4

Build a simple calculator that performs the correct arithmetic operation based on the operator value.

Use if-else statements to check the operator and output the result:

  • If operator is "+", print the sum of num1 and num2
  • If operator is "-", print the difference (num1 - num2)
  • If operator is "*", print the product
  • If operator is "/", print the quotient (num1 / num2)

Output only the numeric result.

Try it yourself

operator = "*"
num1 = 12
num2 = 4

# TODO: Write your code below
# Use if-else statements to check the operator and perform the correct operation
# Output the result using puts

All lessons in Fundamentals

1Introduction to Ruby

What is Ruby?Hello WorldComments in Ruby

4Operators Part 2

Logical Operators Part 1Logical Operators Part 2Recap - Simple LogicLogical Operators Part 3Logical Operators Part 4

7Bill Split Calculator

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

10FizzBuzz with a Twist

Game OverviewThe FizzBuzz MethodProject lessonLooping Through NumbersProject lessonAdding The TwistProject lesson

13Arrays Advanced

Array Slicing with RangesArray Slicing with IndexesArray OperatorsInclude? Method

16Final Challenges

Flat Asterisk PyramidPattern FinderWhat To Buy

2Variables and Data Types

Numbers and VariablesString Data TypeBoolean Data TypeSymbol Data TypeChecking Data TypesNaming ConventionsRecap - Variable Creation

5Decision Making

If StatementIf - ElseRecap - Simple CalculatorNested If - ElseUnless Statement

8Loops

For Loop with RangesWhile LoopBreakNextRecap - FactorialTimes LoopUntil LoopNested LoopsRecap - Dynamic Input

11Arrays

Creating ArraysAccessing Array ElementsModifying ArraysArray MethodsRecap - Product ArrayRecap - Reversed ArrayArray Shortcuts

14Hashes

Creating HashesAccessing Hash ElementsModifying HashesHash MethodsRecap - Product HashSymbols as Hash Keys

3Operators Part 1

Arithmetic OperatorsModulo OperatorArithmetic ShortcutsRecap - Simple MathComparison Operators

6Basic IO

Output with putsOutput with print and pOutput With VariablesInput with getsChomp MethodType ConversionRecap - Age CalculatorRecap - True or False

9Methods

Defining a MethodMethod ParametersReturn ValuesRecap - Sigma MethodRecap - Validation MethodDefault Parameter Values

12Iterating Over Collections

Each IteratorEach with IndexIterating Over StringsMap and Collect

15Daily Expense Tracker

Project OverviewExit The ProgramProject lessonAdd ExpenseProject lessonView All ExpensesProject lessonTotal And AverageProject lessonClear AllProject lessonError HandlingProject lesson