[Error] 'sort' was not declared in this scope

‘inet_pton’ was not declared in this scope

fail api scope is not declared in the privacy agreement

error: 'memcpy' was not declared in this scope的解决

error: ‘_swprintf’ was not declared in this scope 解决办法

OpenCV——报错解决：error: ‘VideoCapture’ was not declared in this scope

FFmpeg：‘UINT64_C‘ was not declared in ths scope

错误解决办法：‘NULL’ was not declared in this scope

Dev-c++下‘stoi‘ was not declared in this scope解决办法

Linux创建父子进程出现error: ‘fork‘ was not declared in this scope pid=fork()；