Definitions

Definitions and declarations look much the same in C; it can also be difficult to tell the difference between initialization and assignment because they use the same symbol. Here I am just trying to visually lay out the various types of statements in order to show clearly what their differences and relationships are.

C/C++

	Variable		Function
Type	Global	Local	(Global)
Declaration	extern int x;		extern int fn();
Definition	int x;		int fn() { ... }
Initialization	int x = 1;
Assignment		x = 1;

See also

• https://stackoverflow.com/questions/23345554/the-differences-between-initialize-define-declare-a-variable