20 Questions
Which term refers to a data storage location whose value can vary and change during program execution?
Memory Cell
What is the purpose of a constant in programming?
To represent fixed values that do not change during program execution
What does an identifier in programming refer to?
A name given to variables, functions, etc., in the code
In programming, what does a memory address represent?
A storage location for variables with varying values
Why are variables essential in programming?
To store changing data during program execution
Which syntax is used when declaring a variable with an initial value in programming?
data type variableName = value ;
What does the number '4' represent in the given syntax?
A placeholder for a value
Which part of the syntax is missing to make it a valid variable declaration without an initial value?
data type variableName ;
What is the purpose of commas in the syntax 'data type vName1 , vName2 ,'?
Indicate a list of variables with the same data type
If a variable's initial value is not provided, what should be done to correctly declare it?
End the declaration statement with only the data type
What is the primary purpose of primitive data types in Java?
To express the basic data stored in variables
Which of the following is NOT considered a primitive data type in Java?
String
What is the range of values that can be stored in a 'byte' variable?
-128 to 127
Which data type should be used in Java to store decimal numbers?
float
What is the size of a 'char' data type in Java?
16 bits
Which of the following is used to represent logical values in Java?
'boolean'
What is the largest value that can be stored in a 'short' variable?
-32768
What happens if you try to store a number larger than the range of a particular data type?
An error occurs and the program crashes
'long' variables in Java are typically used to store:
Whole numbers
'boolean' data type in Java can only hold two values, which are:
'true' and 'false'
Test your knowledge on variables, constants, memory cells, identifiers, and memory addresses. Learn why variables and constants are important in programming, understand the concept of memory cells, identifiers, and memory addresses.
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