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123 lines
3.9 KiB
123 lines
3.9 KiB
<!doctype html> |
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<head> |
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<meta http-equiv="X-UA-Compatible" content="IE=edge"> |
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<title>My Learning Website</title> |
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<body> |
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<div class="banner"> |
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<h1 class="courselink"><a href="https://www.linkedin.com/learning/kotlin-essential-training-2018">Kotlin Essential Training</a></h1> |
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<h2 class="lecturer">LinkedIn Learning : David Gassner : March 2018</h2> |
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<h2 class="episodetitle">Code Sample</h2> |
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</div> |
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<article> |
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<h2 class="sectiontitle">Chapter 5 - Section 3</h2> |
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<pre class="inset"> |
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import Operation.* |
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fun main(args: Array<String>) { |
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try { |
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val number1 = MathLib.getInput("Number 1: ") |
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val number2 = MathLib.getInput("Number 2: ") |
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print("Select an operation (${MathLib.OPERATIONS}): ") |
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val operation = readLine() |
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val result: Double? = |
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when (operation) { |
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ADD.operator -> MathLib.addValues(number1, number2) |
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SUBTRACT.operator -> MathLib.subtractValues(number1, number2) |
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MULTIPLY.operator -> MathLib.multiplyValues(number1, number2) |
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DIVIDE.operator -> MathLib.divideValues(number1, number2) |
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else -> throw Exception("Unknown operation") |
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} |
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println("The answer is $result") |
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} catch (e: NumberFormatException) { |
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println("${e.message} is not a number") |
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} catch (e: Exception) { |
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println(e.message) |
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} |
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} |
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enum class Operation(val operator: String) { |
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ADD("+"), SUBTRACT("-"), MULTIPLY("*"), DIVIDE("/") |
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} |
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class MathLib { |
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companion object { |
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// const val ADD = "+" |
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// const val SUBTRACT = "-" |
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// const val MULTIPLY = "*" |
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// const val DIVIDE = "/" |
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const val OPERATIONS = "+ - * /" |
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fun addValues(number1: Double, number2: Double) = number1 + number2 |
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fun subtractValues(number1: Double, number2: Double) = number1 - number2 |
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fun multiplyValues(number1: Double, number2: Double) = number1 * number2 |
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fun divideValues(number1: Double, number2: Double) = number1 / number2 |
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fun getInput(prompt: String): Double { |
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print(prompt) |
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val string: String? = readLine() |
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val number = string!!.toBigDecimal() |
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return number.toDouble() |
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} |
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} |
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}</pre> |
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</article> |
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<div class="btngroup"> |
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<button class="button" onclick="window.location.href='setting.html';"> |
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Chapter 1 |
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<button class="button" onclick="window.location.href='getstarted.html'"> |
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Chapter 2 |
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</button> |
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<button class="button" onclick="window.location.href='variables.html'"> |
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Chapter 3 |
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</button> |
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<button class="button" onclick="window.location.href='flow.html'"> |
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Chapter 4 |
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</button> |
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<button class="button" onclick="window.location.href='classes.html'"> |
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Chapter 5 |
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</button> |
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<button class="button" onclick="window.location.href='data.html'"> |
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Chapter 6 |
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</button> |
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<button class="button" onclick="window.location.href='inheritance.html'"> |
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Chapter 7 |
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<button class="button" onclick="window.location.href='appendixa.html'"> |
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Appendix A |
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<button class="button" onclick="window.location.href='appendixb.html'"> |
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Appendix B |
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Code Samples |
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Android Page |
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Home |
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