How do i put number on constant

Question

so there is this line
const int x;
how can i put in x what value that i want
and i dont mean by this way:
const int x = 30; // assume that i want 30

Answer 1

NVM i will use readonly

Answer 2

Well, the point of a constant is that it cannot be reassigned a value once it is declared, so your second example is the only way that you could assign it a value.