Variable Declaration & Memory Allocation

Question

I want to know whether memory is allocated during the local variable declaration process.

Suppose I write this code inside function, int a =10; memory i

Answer 1

Local variables are usually stored on stack, so indeed bytes are allocated for int:

int a;

Because it simply uses default value (0), so it is the same as:

int a = 0;

int is a value type, so on stack is stored its value. If you would create local variable with reference type:

SomeClass a;

Then on stack it would be allocated only reference (with value null, as it is default value for reference types). For more information you can refer this question