Constant Variables

Question

is there is any way to make a variable constant after declaration
while we are using a variable in program and we want to make it a constant when we meet a specific value.

Answer 1

I get what you are trying to ask.

I don't think there is a way to convert a variable to const/final var. However, this is what you can do:

int z = 0;
z++;
++z;

//more codes

const int N = z;

When you cannot convert an existing variable to constant, the next best thing would prolly be to assign the value of the existing variable to a a new constant variable. The thing about constants is that they have to be initialised at declaration though.

Answer 2

@Nanda You can also declare your variables anywhere you want in C++.

Answer 3

You can also create a const pointer to the variable, and use const_cast to convert it to const. Here's an example.

https://code.sololearn.com/cELf5b5RSuD7/?ref=app

Answer 4

Thanks all
It means a variable cant become constant after declaration...
definitely Its value can be use.

Answer 5

hi,
In C++ u have to define or declare your variable at the beginning but in java u can declare any where.

if you want to make the variable const after declaration
then create another var and make that var as const with the value u want.

ex:
int a;
after some processing a becomes 10
then create another var
final int b=a;

Answer 6

yes

Answer 7

Hello