What does '&a' do in sizeof(&a)??

Question

int a;
a=100
cout<<"\nExplain Variable of a"<<sizeof(&a);
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Answer 1

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Answer 2

&a means reference to a. sizeof(&a)
will return the size of the reference/(address) of a.
which is in general 8 bytes in 64bit architecture and 4 bytes in 32bit arch .

Answer 3

Hey

Address in C is represented as &a, read as address of a.& is written before any variable because it shows the address of variable where the value will save or what is the address of a .For a 32bit computer, the pointer size can be 4 bytes; 64bit computers can have 8 bytes .It doesn't depend on the data type it points to. Typically size of pointer in C is equal to word size of machine. All types of pointers (void*, int*, char*, long* etc) will have same size (except function pointers).

Answer 4

Here the sizeof(&a) will return the size of an integer which is 8 in 64 bit machine