CodePudding user response:
Might be to use the extern Snake Snake, but this variable does not exist (no statement), you are in the project search Snake Snake * look at whether there is any,CodePudding user response:
Check whether the Snake structure declaration file is included!CodePudding user response:
Does not contain the lib library file, or not added in the realization of the structure, basic it is the case, hope to adopt!