int const vs. const int: Are they Equivalent in C/C ?

const int vs. int const

In C and C , there are two possible ways to declare a constant integer:

• int const x = 3;
• const int x = 3;

Which is the correct way? Are they equivalent?

Answer:

Both int const x = 3; and const int x = 3; are valid code and they are both equivalent. They both declare a constant integer variable named x with a value of 3.

However, in the case of pointer types, int const and const int are not equivalent.

• const int *p = &someInt; declares a pointer whose data cannot be changed through the pointer (it points to a constant integer).
• int * const p = &someInt; declares a pointer who cannot be changed to point to something else (it points to a constant address).

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