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Given the constant declaration const float PI=3.14; which the following is a valid use of PI...

Given the constant declaration
const float PI=3.14;
which the following is a valid use of PI in the program?

(A) PI=2*PI;
(B) cout<<PI*7;
(C) ++PI;
(D) cin>>PI;

and why?
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Answer #1

Answer :

B option is a correct answer cout<<PI*7;

explanation:

Because you already declared PI as a constant variable
And in rest of the option it's might change the value of PI which is not allowed

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