Definitions

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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