Zalim Bashorov
20 lines
511 B
Kotlin
Vendored
20 lines
511 B
Kotlin
Vendored
// Return null if str does not hold a number
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fun myParseInt(str: String): Int? = str.toIntOrNull().also {
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if (it == null) println("One of arguments isn't Int")
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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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}
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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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