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string的常用用法详解:https://blog.csdn.net/qq_42410605/article/details/100517335
gets()和puts():https://blog.csdn.net/qq_42410605/article/details/98734084
getchar()和putchar():https://blog.csdn.net/qq_42410605/article/details/98730475
scanf()和printf():https://blog.csdn.net/qq_42410605/article/details/98726182
字符串的sscanf和sprintf:https://blog.csdn.net/qq_42410605/article/details/94457811
字符串操作:https://blog.csdn.net/qq_42410605/article/details/94433697
字符串的输入输出:https://blog.csdn.net/qq_42410605/article/details/94429603
cin/cout与getline:https://blog.csdn.net/qq_42410605/article/details/102508019
C/C++库函数(tolower/toupper)实现大小写字母之间的转换:https://blog.csdn.net/qq_42410605/article/details/101923724