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).
Each input file contains one test case. Each case contains a pair of integers a and b where ?. The numbers are separated by a space.
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.
-1000000 9
Sample Output:
-999,991
1 import java.util.Scanner; 2 3 public class Main { 4 public static void main(String[] args) { 5 Scanner input = new Scanner(System.in); 6 int a = input.nextInt(); 7 int b = input.nextInt(); 8 input.close(); 9 int sum = a + b; 10 if (sum < 0) { 11 System.out.print("-"); 12 sum = 0 - sum; 13 } 14 String str = String.valueOf(sum); 15 int length = str.length(); 16 StringBuffer stringBuffer; 17 if (length <= 3) { 18 System.out.print(str); 19 } else if (length <= 6) { 20 stringBuffer = new StringBuffer(str); 21 stringBuffer.insert(length - 3, ","); 22 System.out.println(stringBuffer.toString()); 23 } else { 24 stringBuffer = new StringBuffer(str); 25 stringBuffer.insert(length - 3, ","); 26 stringBuffer.insert(length - 6, ","); 27 System.out.println(stringBuffer.toString()); 28 } 29 } 30 }
原文：https://www.cnblogs.com/0error0warning/p/13715487.html