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Recap - Simple Calculator

Part of the Fundamentals section of Coddy's Kotlin journey. Lesson 34 of 93.

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Challenge

Easy

Write a function calculate that takes a, b, and operation and returns the result of performing the specified operation on the two numbers.

Use if-else if-else chains to determine which arithmetic operation to perform based on the operation string.

Conditions:

  • If operation is "add", return the sum of a and b
  • If operation is "subtract", return a minus b
  • If operation is "multiply", return the product of a and b
  • If operation is "divide", return a divided by b (integer division)
  • For any other operation, return 0

Parameters:

  • a (Int): The first number
  • b (Int): The second number
  • operation (String): The operation to perform

Returns: The result of the calculation, or 0 if the operation is not recognized (Int)

Input constraints: For division, the second number is nonzero. All inputs and intermediate results fit in the declared numeric type.

Try it yourself

fun calculate(a: Int, b: Int, operation: String): Int {
    // Write code here
}

All lessons in Fundamentals

1Introduction

The LanguageHello World!CommentsRecap - Launch Message

4Operators Part 1

Arithmetic OperatorsModulo OperatorAugmented AssignmentComparison OperatorsRecap - Simple Math

7Basic IO

Println FunctionString TemplatesReadLine InputType ConversionRecap - Years Until RetirementRecap - True or False

10Functions

Declare A FunctionParameters And ArgumentsReturn ValuesNamed ArgumentsDefault ValuesSingle Expression FunctionsRecap - Sigma FunctionRecap - Validation Function

13Iterating Over Sequences

Iterating Over ElementsWithIndex MethodIterating Over Strings P1Iterating Over Strings P2Recap - Indexed Letters

16Final Challenges

Flat Asterisk PyramidPattern FinderWhat To Buy

2Variables

Val vs VarType InferenceNumbersStringBooleanNaming ConventionsRecap - Initialize Variables

5Operators Part 2

Logical Operators Part 1Logical Operators Part 2Logical Operators Part 3Ternary With If ExpressionRecap - Simple Logic

8Bill Split Calculator

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

11FizzBuzz with a Twist

Game OverviewThe FizzBuzz FunctionProject lessonLooping The NumbersProject lessonAdding The TwistProject lesson

14Lists Advanced

List Slicing With SubListList Slicing With Take DropSequence OperatorsThe Contains MethodRecap - Search a Page

3Nullability

What Is Null SafetyNullable TypesSafe Call OperatorElvis OperatorFunction Challenge BasicsNot Null AssertionRecap - Safe Access

6Decision Making

If StatementIf - ElseIf As An ExpressionWhen ExpressionWhen With RangesRecap - Simple Calculator

9Loops

For LoopWhile LoopDo-While LoopBreakContinueRanges In LoopsNested LoopRecap - FactorialRecap - Dynamic Input

12Lists Basics

List vs MutableListAccessing ElementsModifying ListsList MethodsPair And TripleRecap - Product ListRecap - Reversed List

15Daily Expense Tracker

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

Practice on your own: Kotlin playground