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it's related to c programming input and output questions

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4. Which of the following is not a valid variable name declaration and why?
a) float PI = 3.14;
b) double PI = 3.14;
c) int PI = 3.14;
d) #define PI 3.14
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d) #define PI 3.14

It is a macro preprocessor, it is textual substitution.
So we cant say it as a Variable Declaration.
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