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Solution.java
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Solution.java
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public class Solution {
public String numberToWords(int number) {
if (number == 0) return "zero";
String[] below_twenty = new String[]{
"", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine",
"ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"
};
String[] tens = new String[]{
"", "", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"
};
StringBuilder builder = new StringBuilder();
int place = 1000;
while (number >= 100) {
int d = number / place;
if (d == 0) {
number %= place;
place /= 10;
continue;
}
String suffix;
if (place >= 1000) suffix = " thousand";
else suffix = " hundred";
builder.append(below_twenty[d] + suffix + " ");
number %= place;
place /= 10;
}
while (number != 0) {
if (number >= 20) {
builder.append(tens[number / 10]);
number %= 10;
if (number > 0) {
builder.append("-");
}
} else {
builder.append(below_twenty[number]);
number = 0;
}
}
return builder.toString().trim();
}
public static void main(String[] args) {
Solution s = new Solution();
assert s.numberToWords(1234).equals("one thousand two hundred thirty-four");
assert s.numberToWords(9999).equals("nine thousand nine hundred ninety-nine");
assert s.numberToWords(3018).equals("three thousand eighteen");
assert s.numberToWords(412).equals("four hundred twelve");
assert s.numberToWords(2348).equals("two thousand three hundred forty-eight");
assert s.numberToWords(6040).equals("six thousand forty");
assert s.numberToWords(9).equals("nine");
assert s.numberToWords(0).equals("zero");
assert s.numberToWords(19).equals("nineteen");
}
}