The true meaning of the const limitation in C language is "read-only"

Constants cannot be used in initialization and array dimensions as follows:

Const int n = 5;
Int A [n];

The true meaning of the const qualifier is ''read-only ". The object defined by const is an object that cannot be assigned a value at runtime (the same as usual. Therefore, the value of the object defined by const is not completely a real constant. C and C ++ are different in this regard. If you need a real running time, use the predefined macro # define (or enum ).

In C ++ code, the above Code does not report an error.