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。

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