杭州电子学院OJ练习题，.NET编写，已测试通过-Hangzhou Institute of Electronics OJ exercises,. NET writing, have been tested

字符替换，按照替换规则，将输入的字符串做转换 其它字符不作处理。- Character replacement, according to the substitution rule, the input string will do the conversion other characters do not deal with.