编程接受用户输入的一段英文文字，使用一个数组统计每个字母（不计大小写）出现的次数相对于字母总数的比率，打印显示这个比率。并对字母出现的比率进行排序。-Programmed to accept user input section of the English text, using an array of statistics for each letter (excluding sensitive) the number of occurrences relative to the letter the ratio of the total number of prints shows this ratio. And letters appear in the ratio of the sort.