Which of the following is not a valid c variable name declaration?
(a) float PI = 3.14;
(b) double PI = 3.14;
(c) int PI = 3.14;
(d) #define PI 3.14;
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Which of the following is not a valid c variable name declaration?
(a) float PI = 3.14;
(b) double PI = 3.14;
(c) int PI = 3.14;
(d) #define PI 3.14;
Correct Answer: (d) #define PI 3.14
Explanation: #define is a pre-processor directive. #define is used to define something, for example, we have defined that PI is 3.14. Before going to the compiler, if ‘PI’ comes into the program, then it will be replaced by 3.14.
#define PI 3.14 is a macro preprocessor, it is a textual substitution.