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C++ Interview Questions & Answers

Volatile keyword is useful for memory-mapped peripheral registers, global variables modified by an interrupt service routine, global variables accessed by multiple tasks within a multi-threaded application.

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The const keyword make sure that the value of the variable declared as const can't be changed.

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By declaring a variable volatile, we can tell the compiler that the value of the variable may change any moment from outside of the scope of the program.

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So, the use of const with volatile keyword makes perfect sense. If we see the declaration volatile int *p, it means that the pointer itself is not volatile and points to an integer that is volatile.

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