我编写了一个C++文件,其中包含一个使用std::logf()的函数。它包含了这一行编译器给出了以下错误:math_functions.cpp:49:21: error: ‘logf’ is not a member of ‘std’; did you mean ‘logb49 | float xx =
users (if not exists already) table at programme start up c= db.cursor()
c.execute('CREATE TABLE IF NOT EXISTS user (var TEXT NOT NULL, username TEXT NOT NULLc.execute(find_user, [(self.var.get()), (self.username.g