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#include <stdio.h>
// Variable
declaration:
extern int a, b;
extern
int c;
extern
float
f;
int main ()
{
/* variable
definition: */ int
a, b;
i
n
t
c
;
f
l
o
a
t
f
When the above code is compiled and executed, it produces the following result:
value of c : 30
value of f : 23.333334
The same concept applies on function declaration where you provide a function name at
the time of its declaration and its actual definition can be given anywhere else. For example:
17
