C++ Functions and Value-Returning Functions Chapter 9 Quiz
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Questions and Answers

What is the purpose of using functions in C++?

  • To define variables
  • To generate random numbers
  • To print output to the console
  • To break down large programs into small, manageable sub-tasks (correct)

    • Which of the following is an example of a built-in function in C++?

  • sqrt (correct)
  • generateRandom
  • programFunction
  • main

    • What is the role of the main function in a C++ program?

  • To break down large programs into sub-tasks
  • To perform mathematical calculations
  • To define all user-defined functions
  • To start the execution of the program (correct)

    • Why do programmers use function prototypes in C++?

    <p>To declare the existence of a function and define its return type and parameters</p> Signup and view all the answers

    What does it mean for a variable to have scope and lifetime in C++?

    <p>It determines where in the program a variable can be accessed and how long it exists</p> Signup and view all the answers

    What is the significance of passing information by value to a function in C++?

    <p>It creates a copy of the argument, preventing changes to the original value outside the function</p> Signup and view all the answers

    What does the sqrt function do in C++?

    <p>It returns a number’s square root as a double</p> Signup and view all the answers

    What type of functions are all functions in C++?

    <p>Value-returning</p> Signup and view all the answers

    Which library contains the definition of the sqrt function in C++?

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

    What is the purpose of the pow function in C++?

    <p>To square a number</p> Signup and view all the answers

    What does a value-returning function do in C++?

    <p>It performs a task and then returns precisely one value</p> Signup and view all the answers

    In which range does the program for generating random addition problems require integers to be generated?

    <p>-10 to 10</p> Signup and view all the answers

    What kind of numbers does the sqrt function return in C++?

    <p>'0' if input is negative, otherwise a positive number</p> Signup and view all the answers

    What is the syntax for using the sqrt function in C++?

    <p>$sqrt(x)$</p> Signup and view all the answers

    What does a statement that calls a function do with the return value in C++?

    <p>It assigns the return value to a variable</p> Signup and view all the answers

    What is the purpose of using functions in C++?

    <p>To avoid writing the same code multiple times in a program</p> Signup and view all the answers

    Which library contains the definition of the sqrt function in C++?

    <p>&lt;cmath&gt;</p> Signup and view all the answers

    What type of functions are all functions in C++?

    <p>Value-returning functions</p> Signup and view all the answers

    What does the sqrt function do in C++?

    <p>Finds the square root of a number</p> Signup and view all the answers

    What is the significance of passing information by value to a function in C++?

    <p>It creates copies of the arguments inside the function</p> Signup and view all the answers

    What does a value-returning function do in C++?

    <p>Performs a task and then returns precisely one value</p> Signup and view all the answers

    What is the purpose of functions in C++?

    <p>To break down large programs into small sub-tasks</p> Signup and view all the answers

    What does the 'rand' function do in C++?

    <p>Produces a sequence of pseudo-random numbers</p> Signup and view all the answers

    What is the role of the 'main' function in a C++ program?

    <p>To call other functions</p> Signup and view all the answers

    Which library contains the definition of the 'sqrt' function in C++?

    <p>&lt;math.h&gt;</p> Signup and view all the answers

    What type of numbers does the 'rand' function return in C++?

    <p>Between 0 and &gt; 32767</p> Signup and view all the answers

    What does a value-returning function do in C++?

    <p>Returns a value after computation</p> Signup and view all the answers

    What is the syntax for using the 'sqrt' function in C++?

    Signup and view all the answers

    Why do programmers use function prototypes in C++?

    <p>To declare functions before they are used</p> Signup and view all the answers

    In which range does the program for generating random addition problems require integers to be generated?

    <p>Between 1 and 10</p> Signup and view all the answers

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