从键盘输入一个小于1000的正数，要求输出它的平方根（如果平方根不是整数，则输出其整数部分）。要求在输入数据后对其进行检查是否为小于1000的正数。若不是，则要求重新输入-From the keyboard to enter a positive number of less than 1000, requiring the output of its square root (if the square root is not an integer, the output of its integer part). Requirements to be checked in the input data is less than 1000 positive. If not, the requirement to re-enter