What is the correct way to declare a constant variable named 'PI' with a value of 3.14159 in C++?
A. PI = 3.14159;
B. constant PI = 3.14159;
C. #define PI 3.14159
D. const double PI = 3.14159;
Answer: Option D
A. PI = 3.14159;
B. constant PI = 3.14159;
C. #define PI 3.14159
D. const double PI = 3.14159;
Answer: Option D
Which of the following is a valid variable name in C++?
A. myVariable
B. 123variable
C. variable&
D. float
What is the data type of the variable 'x' in the following declaration: double x = 3.14;?
A. int
B. double
C. float
D. char
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