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C

JUKE BOX

is there any difference in following two instructions:
int a;
extern int a;

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Wim Sturkenboom12y ago
Yes, there is.
- int a will allocate space to store an integer
- extern int a will not allocate memory to store an integer; it tells the compiler that memory for an int a is already allocated somewhere else (another function).
If I recall correctly, you will get errors during the linking phase if int a does not exist and the compiler encounters extern int a.