C++ Function Basics

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Questions and Answers

Which of the following best describes the primary purpose of functions in C++?

  • To create objects and classes.
  • To encapsulate a block of code that performs a specific action, allowing for reuse. (correct)
  • To declare variables that can be used throughout the program.
  • To define the main execution point of a program.

What is the significance of the void keyword in a function declaration?

  • It defines the function as part of a class.
  • It specifies that the function does not return a value. (correct)
  • It means the function can only be called once.
  • It indicates that the function can accept any type of parameter.

Which of the following is the correct way to call a function named calculateSum in C++?

  • function calculateSum;
  • calculateSum;
  • calculateSum(); (correct)
  • call calculateSum();

What is the purpose of parameters in a C++ function?

<p>To pass data into the function for it to operate on. (B)</p> Signup and view all the answers

Consider the following function declaration: int multiply(int a, int b);. What does int signify in this declaration?

<p>The return type of the function. (D)</p> Signup and view all the answers

What happens if you declare a function but never call it in your C++ program?

<p>The program will run, but the function's code will not be executed. (B)</p> Signup and view all the answers

Which of the following code snippets correctly defines a function named greet that takes no arguments and prints "Hello!"?

<p><code>void greet() { cout &lt;&lt; &quot;Hello!&quot;; }</code> (A)</p> Signup and view all the answers

In C++, what is the purpose of the return statement in a function?

<p>To exit the function and optionally send a value back to the caller. (A)</p> Signup and view all the answers

If a function is declared as int calculate(int x, int y), what is the expected data type of the value returned by the function?

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

When a function is called, where does the program execution jump to?

<p>The definition of the called function. (C)</p> Signup and view all the answers

How does defining functions contribute to better code organization and maintainability?

<p>It allows for breaking down complex tasks into smaller, manageable parts. (A)</p> Signup and view all the answers

What is the role of the parentheses () when declaring or calling a function?

<p>They are used to indicate that the declared name is a function, and may contain parameters. (A)</p> Signup and view all the answers

Which of the following is an example of a pre-defined function in C++?

<p><code>main()</code> (D)</p> Signup and view all the answers

What is the key benefit of reusing code through functions?

<p>It avoids code duplication and promotes consistency. (D)</p> Signup and view all the answers

Consider the following function definition: int add(int a, int b) { return a + b; }. What will the function call add(5, 3) return?

<p>8 (D)</p> Signup and view all the answers

What does it mean for declared functions to be 'saved for later use'?

<p>Functions are only executed when they are specifically called by name. (A)</p> Signup and view all the answers

What is the purpose of specifying the void keyword as the return type of a function?

<p>To denote the function does not return any value. (B)</p> Signup and view all the answers

How do you typically call a function in C++ after it has been declared?

<p>By simply stating the function name followed by parentheses. (B)</p> Signup and view all the answers

Which part of the following function declaration specifies what the function will do? void exampleFunction() { /* code here */ }

<p><code>/* code here */</code> (A)</p> Signup and view all the answers

Why are functions considered important for reusing code in programming?

<p>They allow a block of code to be executed multiple times without rewriting it. (A)</p> Signup and view all the answers

What is the significance of the semicolon (;) when calling a function in C++?

<p>It marks the end of the function call statement. (D)</p> Signup and view all the answers

Imagine you have a function int getArea(int length, int width). What are length and width?

<p>Parameters (C)</p> Signup and view all the answers

If a C++ function doesn't return a value, what keyword is used to indicate this?

<p>void (D)</p> Signup and view all the answers

Which of these code snippets shows the correct way to declare a function called add that takes two integers as input?

<p>int add (int a, int b) {} (C)</p> Signup and view all the answers

What happens when you call a function in your C++ code?

<p>The program executes the code inside the function. (A)</p> Signup and view all the answers

Why is it a good practice to use functions to break down a program into smaller parts?

<p>It makes the code easier to read, understand, and maintain. (D)</p> Signup and view all the answers

Which of the following functions is an essential part of every C++ program?

<p>main() (A)</p> Signup and view all the answers

If a function is defined as int myFunction(int x), what type of argument does it expect?

<p>An integer (D)</p> Signup and view all the answers

What does the return keyword do in a C++ function?

<p>It sends a value back to where the function was called and exits the function. (A)</p> Signup and view all the answers

You have a function declared as follows: void myFunc(). Which action is this function designed to perform?

<p>The function performs a task without returning a value. (D)</p> Signup and view all the answers

Which of the following is the correct syntax for calling a function named displayResult that takes no arguments?

<p>displayResult() (D)</p> Signup and view all the answers

How does using functions contribute to minimizing code duplication in a project?

<p>By providing a way to execute the same block of code from multiple locations. (A)</p> Signup and view all the answers

If you define a function but forget to call it, what will be the result when you run the program?

<p>The program will run, but the code inside the function will not be executed. (B)</p> Signup and view all the answers

In a function declaration, like double calculateArea(int length, int width), what is double?

<p>The return type. (D)</p> Signup and view all the answers

What is the primary reason for using parameters when defining a function?

<p>To enable the function to operate on specific data passed to it. (C)</p> Signup and view all the answers

Which of the following snippets shows the correct way to call a function named processData that takes an integer 5 as an argument?

<p>processData(5); (A)</p> Signup and view all the answers

Why are functions referred to as 'saved for later use'?

<p>Because they are not executed until they are called by name. (D)</p> Signup and view all the answers

Consider the following function: int calculateArea(int length, int width) { return length * width; }. If you call calculateArea(10, 5), what will be the return value?

<p>50 (A)</p> Signup and view all the answers

What does the code inside the curly braces {} in a function definition specify?

<p>The action the function performs. (C)</p> Signup and view all the answers

Why is it beneficial to reuse code through functions?

<p>It avoids redundant code and enhances code consistency. (A)</p> Signup and view all the answers

Flashcards

What is a function?

A block of code that runs when it is called.

What are parameters?

Data passed into a function when it is called.

What does it mean to declare a function?

To create a function by specifying its name.

How to call a function?

The name of the function followed by parentheses () and a semicolon ;

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What is myFunction()?

The name of the function.

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What does void mean?

Indicates the function does not return a value.

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What does the function body do?

It defines actions that the function should perform.

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Study Notes

C++ Functions Overview

  • A function is a block of code executed only when called.
  • Data can be passed into a function as parameters.
  • Functions are useful for code reuse: write once, use many times.

Creating a Function

  • Specify the function's name followed by parentheses () to declare it.

Function Syntax

  • void myFunction() { // code to be executed }
  • myFunction() is the function's name.
  • void indicates the function doesn't return a value.
  • The code defining the function's action is placed inside the function body.

Calling a Function

  • Declared functions are executed when called.
  • To call a function, write its name followed by parentheses () and a semicolon ;.

Function Call Example

  • To print text using myFunction():
// Create a function
void myFunction() {
  cout << "I just got executed!";
}

int main() {
  myFunction();
  return 0;
}

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