Answer / ravi.jnv

Volatile is to inform the compiler that not to optimise
code.
for ex:
int a = port1;
int b = port1;
int c = port1;

compiler may convert it as
int a=b=c=port1;

so avoid it , u have to use volatile keyword.

Answer / nikhil

Basically, it is a type qualifier.
a volatile data type is used at optimizer level.
Generally, in the embedded coding, When the optimizer is Set
on "favor size". The data type declaration as volatile
declares to compiler that the value of this data type can
change beyond the program flow(like interrupts.
Otherwise if the optimizer is enable, the program malfunctions.

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