Calculate a+b and output the sum in standard format – that is, the digits must be separated into groups of three by commas (unless there are less than four digits).
Input Specification:
Each input file contains one test case. Each case contains a pair of integers a and b where −10
6
≤a,b≤10
6
. The numbers are separated by a space.
Output Specification:
For each test case, you should output the sum of a and b in one line. The sum must be written in the standard format.
Sample Input:
-1000000 9
Sample Output:
-999,991
输入a,b两个数，将a，b之和进行格式化输出，每三位加一个逗号，不满三位不变
代码：
import java.text.DecimalFormat;
import java.util.Scanner;
public class Main {
public static void main(String[] args) throws Exception {
Scanner in = new Scanner(System.in);
int a = in.nextInt();
int b = in.nextInt();
int sum =a+b;
String str = String.valueOf(sum);
if(str.length()<4)
System.out.println(sum);
else
System.out.println(new DecimalFormat(",###").format(sum));
}
}