Thousand Separator
Given an integer n, add a dot (".") as the thousands separator and return it in string format.
Example 1:
Input: n = 987
Output: "987"
Example 2:
Input: n = 1234
Output: "1.234"
Example 3:
Input: n = 123456789
Output: "123.456.789"
Example 4:
Input: n = 0
Output: "0"
Constraints:
0 <= n < 2^31
Recommended: Please try your approach on your integrated development environment (IDE) first, before moving on to the solution.
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Logic is to look and find the required position and to insert(".") to the position.
Solution
( Java )
class Solution {
public String thousandSeparator(int n) {
StringBuilder s = new StringBuilder().append(n);
for(int i=s.length()-3;i>0;i-=3){
s.insert(i,".");
}
return s.toString();
}
}
