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Explain What are the different qualifiers in C?

Answer:

1) Volatile:
A variable should be declared volatile whenever its value could change unexpectedly. In practice, only three types of variables could change:
► Memory-mapped peripheral registers
► Global variables modified by an interrupt service routine
► Global variables within a multi-threaded application

2) Constant:
The addition of a 'const' qualifier indicates that the (relevant part of the) program may not modify the
variable.

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