Confused between C and D option??

Question

Comments

a is defined as constant int so it can't be changed its a read only variable now therefore there will be compile time error.

Answer 1

D. a will be replaced by 6 everywhere by compiler optimization. and ++6 does't make sense for compiler

Comments

it's constant int. not #define

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#define replaced in pre processing itself it doesnot make to compiler. This will be replaced in compiler optimization

One correction it is not done in compiler optimization. It will be done in syntax analysis as error message in following suggests.

See this : http://ideone.com/MN6LCC

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modification of constant variable will give compilation error