C++ Variable Declaration Quiz
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Questions and Answers

What is a variable in C++?

  • A name used to refer to computer storage locations (correct)
  • A function to calculate values
  • A constant value that cannot be changed
  • An operator used for comparison
  • What is the purpose of a regular variable in C++?

  • To perform arithmetic operations
  • To store a value that can change or vary (correct)
  • To store a value that cannot be changed
  • To compare empty containers
  • How is a constant variable different from a regular variable in C++?

  • Constant variables have fixed values that cannot be changed (correct)
  • Constant variables can only be declared once
  • Constant variables are used for arithmetic operations
  • Constant variables can store multiple values
  • What does the '==' operator represent in C++?

    <p>Relational/comparison operator</p> Signup and view all the answers

    In C++, what are reserved words?

    <p>Words that must be used only for their specified purpose</p> Signup and view all the answers

    What are local variables in C++?

    <p>Variables that are declared inside a function or block</p> Signup and view all the answers

    Where are global variables declared?

    <p>Outside all the function blocks</p> Signup and view all the answers

    What happens if a global variable is not initialized?

    <p>It takes zero by default</p> Signup and view all the answers

    Where are local variables stored in memory?

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

    How long does a local variable exist in a program?

    <p>Until the end of the function in which it is declared</p> Signup and view all the answers

    Which operator is used for division in C++?

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

    What does the logical NOT operator '!' do in C++?

    <p>Negates the value of an expression</p> Signup and view all the answers

    Which data type stores fractional numbers containing 15 decimal digits in C++?

    <p>'double'</p> Signup and view all the answers

    How do you read input from the user in C++?

    <p>Using '&lt;&lt;' operator with 'cin'</p> Signup and view all the answers

    What does the assignment operator '+=' do in C++?

    <p>Performs addition assignment</p> Signup and view all the answers

    In C++, which data type stores true or false values?

    <p>'bool'</p> Signup and view all the answers

    Study Notes

    Variables in C++

    • Variables in C++ are containers that store data.
    • Regular variables hold values that can be changed during program execution.
    • Constant variables are assigned a value once and cannot be changed later.
    • The '==' operator checks if two values are equal, returning "true" if they are and "false" if they are not.
    • Reserved words are keywords that have special meaning in C++ and cannot be used as identifiers.
    • Local variables are declared within a function or block of code, and are only accessible within that scope.
    • Global variables are declared outside of any function, and are accessible from anywhere in the program.
    • If a global variable is not initialized, it will be assigned a default value, typically zero.
    • Local variables are stored in the stack section of memory.
    • Local variables exist only during the execution of the function or block of code where they are declared.
    • '/' is the division operator in C++.
    • The logical NOT operator '!' reverses the logical value of an expression, turning "true" to "false" and "false" to "true".
    • double is the data type used to store fractional numbers with 15 decimal digits in C++.
    • cin is used to read input from the user in C++.
    • The '+=' operator adds a value to the existing value of a variable and assigns the result to the variable.
    • bool is the data type used to store boolean values (true or false) in C++.

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    Test your knowledge about variable declaration in C++. Learn about regular variables, constant variables, and their importance in programming.

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