Java MCQ: Which of the following is a valid Java variable declaration?
a) int number = 10;
b) float 2value = 5.5;
c) char letter = ‘A’;
d) Both a and c
Answer:
d) Both a and c
Explanation:
In Java, a valid variable declaration must follow specific syntax rules. The variable name must start with a letter, underscore, or dollar sign, and cannot start with a digit. Therefore, int number = 10; and char letter = 'A'; are valid declarations, while float 2value = 5.5; is invalid because the variable name starts with a digit.
Variables in Java must also be of a specific data type, such as int, float, char, etc., and the value assigned to the variable must be compatible with the declared type.
Understanding variable declaration rules is fundamental for writing correct and error-free Java programs.
Reference links:
https://www.rameshfadatare.com/learn-java-programming/
https://www.javaguides.net/p/java-tutorial-learn-java-programming.html