▍1. surprising-munbers
C语言实现 一个自然数的七进制表达式是一个三位数,而这个自然数的九进制表示也是一个三位数,且这两个三位数的数码顺序正好相反,求这个三位数。(C language a natural number is a seven-digit hexadecimal expression, and this natural number is a nine-digit hexadecimal representation, and the two-digit digital opposite order, find the three digits.)