回文数的判断与生成

Posted 2021-01-31 fengxia

判断是不是回文数

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    public static void PJ() {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入一个整数:");
        int num = sc.nextInt();
        String s = num+"";
        String s1 ="";
        for (int i = s.length()-1; i>=0; i--) {
            s1+=s.charAt(i);
        }
        if (s.equals(s1)) {
            System.out.println("是回文数");
        }else {
            System.out.println("不是回文数");
        }
    }

生成回文数

    public static void generate() {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入一个整数:");
        int num = sc.nextInt();
        String s = num+"";
        String s1="";
        for (int i = s.length()-1; i>=0; i--) {
            s1+=s.charAt(i);
        }
        System.out.println("它的回文数是"+s1);
    }