26 lines
803 B
Ceylon
26 lines
803 B
Ceylon
shared void run() {
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print("please enter two numbers for me to add");
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value input = process.readLine();
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if (exists input) {
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value tokens = input.split().map(Integer.parse);
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if (tokens.any((element) => element is ParseException)) {
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print("numbers only, please");
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return;
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}
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value numbers = tokens.narrow<Integer>();
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if (numbers.size != 2) {
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print("two numbers, please");
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}
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else if (!numbers.every((Integer element) => -1k <= element <= 1k)) {
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print("only numbers between -1000 and 1000, please");
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}
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else if (exists a = numbers.first, exists b = numbers.last) {
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print(a + b);
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}
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else {
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print("something went wrong");
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}
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}
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}
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