编写一子个函数，由实参传来一个字符串，统计此字符串中字母、数字、空格和其他字符的个数。在主函数中输入字符串以及输出上述的结果。-A son and a write function, the arguments came a string of statistics in this string of letters, numbers, spaces, and the number of other characters. In the main function in the input st