pTalanov
24 lines
573 B
Kotlin
24 lines
573 B
Kotlin
// Return null if str does not hold a number
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fun myParseInt(str : String) : Int? {
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try{
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return parseInt(str)
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} catch (e: NumberFormatException) {
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println("One of argument isn't Int")
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}
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return null
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}
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fun main(args : Array<String>) {
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if (args.size < 2) {
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print("No number supplied");
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} else {
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val x = myParseInt(args[0])
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val y = myParseInt(args[1])
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// We cannot say 'x * y' now because they may hold nulls
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if (x != null && y != null) {
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print(x * y) // Now we can
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}
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}
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}
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