import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); while(true){ int num1 = sc.nextInt(); int num2 = sc.nextInt(); if(num1 == 0 & num2 == 0){ break; } System.out.println(num1 + num2); } } } 写一个循环,终止条件为a==0&&b==0。