Variables and Data Types: Understanding Identifiers and Assignment Operators
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Questions and Answers

What is the purpose of an equal sign in Java?

  • To assign a value to a variable (correct)
  • To perform mathematical operations
  • To indicate inequality
  • To compare two values

    • Which of the following is not allowed when naming a variable in Java?

  • Starting the variable name with a digit
  • Using spaces in the variable name
  • Using special characters in the variable name (correct)
  • Using reserved words as the variable name

    • What type of values does the 'double' data type hold in Java?

  • Integer values
  • Multiple characters
  • Decimal values (correct)
  • True and false values

    • What is the maximum value that can be held by the 'int' data type in Java?

    <p>231-1</p> Signup and view all the answers

    Which data type is used to hold a sequence of characters in Java?

    <p>char</p> Signup and view all the answers

    What is the purpose of a string data type in Java?

    <p>To hold a sequence of characters</p> Signup and view all the answers

    What is the purpose of a semi-colon in Java programming?

    <p>To end a statement</p> Signup and view all the answers

    Why is String considered a non-primitive data type in Java?

    <p>Because it's constructed from other data types (characters)</p> Signup and view all the answers

    What does it mean to initialize a variable?

    <p>To assign an initial value to the variable</p> Signup and view all the answers

    How would you cast from double to int in Java?

    <p>(int) value</p> Signup and view all the answers

    What is the purpose of declaring a variable?

    <p>To specify the data type and name of the variable</p> Signup and view all the answers

    Why does String start with a capital letter in Java?

    <p>To differentiate it from primitive data types</p> Signup and view all the answers

    When will you use casting in Java?

    <p>To change the data type of a value</p> Signup and view all the answers

    What does it mean to declare a variable in Java?

    <p>To specify the data type and name of the variable</p> Signup and view all the answers

    What happens during promotion in Java?

    <p>An integer is converted to a double automatically</p> Signup and view all the answers

    Why do statements in Java need to end with a semi-colon?

    <p>To signify the end of a statement</p> Signup and view all the answers

    What is the purpose of a semi-colon in Java programming?

    <p>To separate multiple statements in Java</p> Signup and view all the answers

    Why is String considered a non-primitive data type in Java?

    <p>Because it is made up of other data types (characters)</p> Signup and view all the answers

    What does it mean to declare a variable in Java?

    <p>To assign a data type and name to the variable</p> Signup and view all the answers

    When will you use casting in Java?

    <p>To change the data type of a value during assignment</p> Signup and view all the answers

    What happens during promotion in Java?

    <p>An integer is automatically converted into its corresponding double value</p> Signup and view all the answers

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