JAVA

public class Test010 {
    public static void main(String[] args){
        boolean flag = true;
        while(flag){
            Scanner sc = new Scanner(System.in);
            System.out.println("请输入第一个正整数，按回车结束输入：");
            int a = sc.nextInt();
            System.out.println("请输入第二个正整数，按回车结束输入：");
            int b = sc.nextInt();
            int c = 1;
            try {
                if(a<0 || b<0){
                    throw new MyException();
                }else{
                    while(b!=0){
                        c = a%b;
                        a = b;
                        b = c;
                    }
                    System.out.println("最大公约数是:"+a);
                    flag = false;
                }
            }catch(MyException e){
                e.printStackTrace();
            }
        }
    }
}
class MyException extends Exception{
    @Override
    public void printStackTrace() {
        System.out.println("您输入的数字是负数，请确认后再输入。");
    }
}