Which of the following is not a valid way to declare a long variable in Java?
A. long x = 123L
B. long y = 123
C. long z = 123.0
D. long w = 0x1L
Answer: Option C
Solution(By Examveda Team)
The correct answer is Option C: long z = 123.0.In Java, the correct way to declare a long variable is by using Option A, Option B, or Option D. However, Option C is not a valid way to declare a long variable because it attempts to assign a double value (123.0) to a long variable without type casting.
Here's the breakdown:
Option A: long x = 123L - This is a valid way to declare a long variable in Java, where x is assigned the long value 123L (note the "L" suffix to indicate a long literal).
Option B: long y = 123 - This is also a valid way to declare a long variable in Java, where y is assigned the long value 123 (Java allows you to assign integer literals to long variables without requiring a suffix).
Option C: long z = 123.0 - This is not a valid way to declare a long variable because it attempts to assign a double value (123.0) to a long variable without type casting. It would result in a compilation error.
Option D: long w = 0x1L - This is a valid way to declare a long variable in Java using hexadecimal notation. w is assigned the long value 1L (note the "L" suffix to indicate a long literal).
So, among the provided options, Option C is not a valid way to declare a long variable in Java because it attempts to assign a double value to a long variable without type casting.
Related Questions on Data Types and Variables
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A. 127
B. 255
C. 32767
D. 64
What is the default value of an int variable in Java if it's not explicitly initialized?
A. 0
B. 1
C. -1
D. Null
Which of the following is not a valid identifier for a Java variable?
A. my_var
B. _myVar
C. 3rdVar
D. $var
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