1.1 Variables and Data Types

• The kind of data a variable can store is called its type
• Floating-point numbers are more precise than integers

  False
• The `boolean` data type can store only true or false values


  True
• What role do variables play in programming?

  Transform data
• What does the `int` data type store in Java?

  Whole numbers
• For what purpose is the `boolean` data type used in Java?

  Logical states
• What is the precision of the `double` data type in Java?

  Floating-point (approximate)
• The `char` data type in Java is used to store a single Unicode character.
• A floating-point data type is used to store numbers with decimals
• How many main primitive data types are there in Java?

  Four
• What is a floating-point number?

  Number with decimal points
• Match the Java primitive data type with its description:

  int ↔️ Whole numbers without decimal points

  double ↔️ Numbers with decimal points

  boolean ↔️ True or false values

  char ↔️ Single Unicode character
• What is the purpose of data types in programming?

  Specify data storage
• The four primitive data types in Java are int, double, boolean, and char.
• Each primitive data type has specific memory requirements and ranges
• What is the main difference between integers and floating-point numbers in terms of precision?

  Integers are precise, doubles are approximate
• What does the `double` data type store in Java?

  Numbers with decimal points
• The key difference between `int` and `double` is that `int` stores whole numbers, while `double` can store numbers with decimals
• The `boolean` data type in Java can only store the values `true` or `false`.


  True
• Match the aspect of a variable with its description:

  Name ↔️ Unique identifier of the variable

  Type ↔️ Kind of data the variable can store

  Value ↔️ Actual data the variable holds

  Scope ↔️ Region of the program where accessible
• What is the `String` data type used for in Java?

  Sequences of characters
• What is a data type in programming?

  Classifications specifying data kinds
• Boolean values can only be true or false.

  True
• Why may a double have rounding errors?

  How decimals are stored
• The char data type occupies 2 bytes of memory in Java.


  True
• Double may have rounding errors due to how it represents decimal values in memory.


  True
• Is Java statically typed?

  Yes
• What is a variable in programming?

  Named storage location
• Match the data type with its description:

  Integer ↔️ Whole numbers without decimal points

  Floating-point ↔️ Numbers with decimal points

  Boolean ↔️ True or false values

  String ↔️ Sequences of characters
• What type of data does the `int` data type store?

  Whole numbers
• Steps in declaring and assigning a variable

  1️⃣ Declare the variable with its data type

  2️⃣ Give the variable a unique name

  3️⃣ Assign a value to the variable
• In Java, primitive data types are the basic building blocks for storing simple data values
• Each primitive data type in Java has specific memory requirements and value ranges.


  True
• How much memory does the `int` data type require in Java?

  4 bytes
• How much memory does the `char` data type require in Java?

  2 bytes
• What is the purpose of data types in programming?

  Specify the kind of data
• Floating-point numbers may have rounding errors due to their storage in memory.

  True
• An integer is a whole number without decimal points
• Integers are precise but limited to whole numbers, while floating-point numbers may have rounding errors
• An int uses 4 bytes of memory, while a double uses 8 bytes.