12 39 C:\WY\socket\socket\text3.cpp [Error] 'nullptr' was not declared in this scope

Question

为什么会出现 (12 39 C:\WY\socket\socket\text3.cpp [Error] 'nullptr' was not declared in this scope)

Answer 1

nullptr 是从c++11标准开始支持的关键词，打开你的编译器对c++11的支持