Global variables can only be in the first. Define c, declared in header files,

CodePudding user response:

Not necessarily, if the header files may be introduced by multiple source files, so can't define a global variable in the header files, on the other hand, no problem ~

CodePudding user response:

Don't recommend the use of global variables, if want to use, be sure to add the static

CodePudding user response:

Global variable declaration and definition still together! This view and facilitate calls,