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  1. Which of the following is not a valid variable name declaration?
    1. #define PI 3.14
    2. int PI = 3.14;
    3. double PI = 3.14;
    4. float PI = 3.14;
    5. None of these
Correct Option: A

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


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