Constants

If we add the keyword `const' in a variable declaration, the variable will be treated as a constant. Its value cannot be changed in the program. Consider the following:

 const int number=10;

Here, we have declared the variable `number' with the keyword `const' and assigned it a value of 10. `number' is now a constant and it will always have the value 10. If we try to change the value with a statement like:

 number=20;

our code will generate an error.

Also note that we need to assign the value in the constant when we declare it:

 const int number=10;

If we do it like a variable,

 const int number; number=10;

this will also result in error.