编写一个成绩统计程序，接收一批（最多20个）从键盘录入的0-100之间的十进制格式的分数值，无数据直接回车时结束成绩录入。然后显示录入的总人数，总分，平均分值（十进制整数格式），显示优秀，良好，中等，及格和不及格人数。-Performance statistics to write a program, receive a number (up to 20) 0-100 from the keyboard entry of scores between the decimal format value, no carriage return at end of the performance data directly input. Then displays the total number of entry, the total score, average score (decimal integer format), showing excellent, good, medium, number of pass and fail.