#define: constant
global variable: variable

*Sigh*

const int i = 123; // constant
int i = 123; // global variable
#define i 123 // technically creates a literal, not a constant, everywhere it is replaced, with no meaningful name for the compiler to use

#define: constant
global variable: variable

*Sigh*

const int i = 123; // constant
int i = 123; // global variable
#define x 123 // technically creates a literal, not a constant, everywhere it is replaced, with no meaningful name for the compiler to use