一个可以随机生成不同个数的熊猫，如何输入正确的答案，就可以继续随机生成熊猫，若错误，则提示输入错误，要求重新输入！-Can randomly generate a different number of pandas, how to enter the correct answer, you can continue to randomly generate a panda, if wrong, you are prompted for an error, requiring re-enter!