Thousand Separator
给一个数字n, 返回加千位点号的n的字符串.
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class Solution { public String thousandSeparator(int n) { StringBuilder sb = new StringBuilder(); StringBuilder t = new StringBuilder(n+""); String s = t.reverse().toString(); for(int i = 0 ; i < s.length(); i++) { if(i != 0 && i % 3 == 0) sb.append("."); sb.append(s.charAt(i)); } return sb.reverse().toString(); } } |