Answer:
In c++, you can pass a variable by reference and still prevent the function from changing its value by using the keyword const in the formal parameter.
Const is a keyword used to determine given identifier is a constant i.e its value can't be changed.
const is used to determine a variable worth that can't be changed.
e.g. : const int a = 10;
presently above worth of a can't be changed.
in the event that the keyword const is used in the function definition, it gives the client an affirmation that it won't change any value passed to it.
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