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Difference between int a and extern int a. why the first one is definition while the second is declaration please explain?
Wiki User
∙ 14y ago
The declaration 'int a' both declares the variable of 'a' and allocates memory for it.
When you use 'extern' you are referring to a variable called 'a' that has its memory allocated in another module. The actual variable 'a' is not in the same compilation unit as the current one being compiled. Where the variable 'a' is located is resolved by the linker.
When using 'extern' you state your intent to use a variable called 'a', but it doesn't reserve any memory for it in the current module.
Wiki User
∙ 14y ago
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