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47 lines
1.0 KiB
47 lines
1.0 KiB
2 years ago
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package class32;
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import java.util.HashMap;
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public class Problem_0166_FractionToRecurringDecimal {
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public static String fractionToDecimal(int numerator, int denominator) {
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if (numerator == 0) {
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return "0";
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}
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StringBuilder res = new StringBuilder();
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// "+" or "-"
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res.append(((numerator > 0) ^ (denominator > 0)) ? "-" : "");
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long num = Math.abs((long) numerator);
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long den = Math.abs((long) denominator);
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// integral part
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res.append(num / den);
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num %= den;
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if (num == 0) {
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return res.toString();
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}
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// fractional part
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res.append(".");
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HashMap<Long, Integer> map = new HashMap<Long, Integer>();
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map.put(num, res.length());
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while (num != 0) {
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num *= 10;
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res.append(num / den);
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num %= den;
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if (map.containsKey(num)) {
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int index = map.get(num);
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res.insert(index, "(");
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res.append(")");
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break;
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} else {
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map.put(num, res.length());
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}
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}
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return res.toString();
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}
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public static void main(String[] args) {
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System.out.println(fractionToDecimal(127, 999));
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}
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}
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