IGDTUW 2025 — Computer PYQ

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Question

IGDTUW 2025 — Computer PYQ

IGDTUW | Computer | 2025

Which keyword is used to declare a variable that is intended to be immutable?

Choose the correct answer:

Explanation

The correct answer is (b) const.

Explanation

In C and C++, the const keyword is used to qualify a variable as immutable, meaning its value cannot be modified after it has been initialized. This is a crucial concept for ensuring data integrity and preventing accidental changes to values that should remain constant throughout the program's execution.

Conceptual Mathematical Model

If we define a mutable variable $V$ that can change over time, the value at time $t_{1}$ does not necessarily equal the value at time $t_{2}$ :

$V (t_{1}) \neq = V (t_{2})$

However, if we declare a variable using the const keyword, we enforce the property of immutability, ensuring that the value remains constant for all time $t$ :

$C o n s t_V a r iab l e (t_{1}) = C o n s t_V a r iab l e (t_{2})$