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Editorial Team
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Asked: 2026-06-07T21:06:21+00:00

I came across the following problem while reading …just cant get the logic behind

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I came across the following problem while reading …just cant get the logic behind this.

auto int c;
static int c;
register int c;
extern int c;

It is given that the first three are definition and last one is declaration ..how come ?

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1 Answer

  1. Editorial Team

    The last one with extern does not define storage for c. It merely indicates that c exists somewhere and the linker should be able to resolve it to some global c defined elsewhere.

    If you compiled and linked a single .c file and tried to use the last c you’d have a linker error. With the the first 3 cs you would not as they have substance (they’ve been defined) in the current compilation unit.

    If you’d like to learn more about extern and declaration vs definition here’s a good article on the topic. To quote from that article:

    Declaration of a variable/function simply declares that the variable/function exists somewhere in the program but the memory is not allocated for them

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