78 lines
2.4 KiB
Text
78 lines
2.4 KiB
Text
module NumberNames {
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void run() {
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@Inject Console console;
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Int[] tests = [0, 1, -1, 11, -17, 42, 99, 100, 101, -111, 1000, 1234, 10000, 100000,
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123456789000, 0x123456789ABCDEF];
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for (Int test : tests) {
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console.print($"{test} = {toEnglish(test)}");
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}
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}
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static String[] digits = ["zero", "one", "two", "three", "four",
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"five", "six", "seven", "eight", "nine"];
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static String[] teens = ["ten", "eleven", "twelve", "thirteen", "fourteen",
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"fifteen", "sixteen", "seventeen", "eighteen", "nineteen"];
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static String[] tens = ["zero", "ten", "twenty", "thirty", "forty",
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"fifty", "sixty", "seventy", "eighty", "ninety"];
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static String[] ten3rd = ["?", "thousand", "million", "billion", "trillion",
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"quadrillion", "quintillion"];
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static String toEnglish(Int n) {
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StringBuffer buf = new StringBuffer();
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if (n < 0) {
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"negative ".appendTo(buf);
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n = -n;
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}
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format3digits(n, buf);
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return buf.toString();
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}
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static void format3digits(Int n, StringBuffer buf, Int nested=0) {
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(Int left, Int right) = n /% 1000;
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if (left != 0) {
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format3digits(left, buf, nested+1);
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}
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if (right != 0 || (left == 0 && nested==0)) {
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if (right >= 100) {
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(left, right) = (right /% 100);
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digits[left].appendTo(buf);
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" hundred ".appendTo(buf);
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if (right != 0) {
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format2digits(right, buf);
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}
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} else {
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format2digits(right, buf);
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}
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if (nested > 0) {
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ten3rd[nested].appendTo(buf).add(' ');
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}
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}
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}
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static void format2digits(Int n, StringBuffer buf) {
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switch (n) {
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case 0..9:
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digits[n].appendTo(buf).add(' ');
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break;
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case 10..19:
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teens[n-10].appendTo(buf).add(' ');
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break;
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default:
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(Int left, Int right) = n /% 10;
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tens[left].appendTo(buf);
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if (right == 0) {
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buf.add(' ');
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} else {
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buf.add('-');
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digits[right].appendTo(buf).add(' ');
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}
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break;
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}
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}
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}
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