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What is the difference between a declaration of a variable and a definition of var in C?

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Presentation of variable intend to tell compiler their is a var\funct\struct of specific information type.

Meaning of variable mean requesting that compiler distribute memory to variable or characterize stockpiling for that variable.

you can characterize a variable just one time however you can announce it the same number of time you need.

extern int a;/presentation of var and compiler thinks this var is characterized in some other record
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