题解 | #添加逗号#
添加逗号
http://www.nowcoder.com/practice/f51c317e745649c0900996fd3f683aed
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
String str = scanner.next();
StringBuilder stringBuilder = new StringBuilder(str);
for(int index = str.length() - 3; index > 0; index -= 3){
stringBuilder.insert(index, ',');
}
System.out.print(stringBuilder.toString());
}
}
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