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  1. Which of the following is not a valid variable name declaration?
    2. A.
    float PI = 3.14;
    B.
    double PI = 3.14;
    C.
    int PI = 3.14;
    D.
    #define PI 3.14

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    Answer : Option D

    Explanation :

    #define PI 3.14 is a macro preprocessor, it is a textual substitution.

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