目录1正文4一、C++的string的使用41.1C++string简介41.2string的成员41.2.1append41.2.2assign51.2.3at51.2.4begin61.2.5c_str61.2.6capacity61.2.7clear71.2.8compare71.2.9copy71.2.10_Copy_s71.2.11data71.2.12empty71.2.13end71.2.14erase71.2.15find71.2.16find_first_not_of81.2.17find_first_of81.2