程序提示用户输入一行字符串（字符个数不超过80个，该字符串用回车符结束）。并按字母，数字及其他字符分类计数，然后将结果存入以char、digit和other为名的存储单元-Program prompts the user to enter a line string (no more than 80 the number of characters, the string ends with a carriage return). Press letters, numbers and other