C, C + + notes

June 2017 reading book "C and Pointers"

#if 0

#endif

Better than commenting out the code. ("C and Pointers" 2017.06.07)

Differences between global variables and global static variables 1) Global variables are global variables that do not explicitly use static adornments, global variables are externally linked by default, scope is the entire project, global variables defined within one file, and in another file, through the declaration of the extern global variable name, You can use global variables. 2) A global static variable is a global variable that is explicitly modified with static, scoped to the file where the variable is declared, and the other file is not used with the extern declaration. (2017.06.07)

C, C + + notes