Podcast
Questions and Answers
Which of the following best describes the primary purpose of functions in C++?
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?
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++?
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?
What is the purpose of parameters in a C++ function?
Consider the following function declaration: int multiply(int a, int b);
. What does int
signify in this declaration?
Consider the following function declaration: int multiply(int a, int b);
. What does int
signify in this declaration?
What happens if you declare a function but never call it in your C++ program?
What happens if you declare a function but never call it in your C++ program?
Which of the following code snippets correctly defines a function named greet
that takes no arguments and prints "Hello!"?
Which of the following code snippets correctly defines a function named greet
that takes no arguments and prints "Hello!"?
In C++, what is the purpose of the return
statement in a function?
In C++, what is the purpose of the return
statement in a function?
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?
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?
When a function is called, where does the program execution jump to?
When a function is called, where does the program execution jump to?
How does defining functions contribute to better code organization and maintainability?
How does defining functions contribute to better code organization and maintainability?
What is the role of the parentheses ()
when declaring or calling a function?
What is the role of the parentheses ()
when declaring or calling a function?
Which of the following is an example of a pre-defined function in C++?
Which of the following is an example of a pre-defined function in C++?
What is the key benefit of reusing code through functions?
What is the key benefit of reusing code through functions?
Consider the following function definition: int add(int a, int b) { return a + b; }
. What will the function call add(5, 3)
return?
Consider the following function definition: int add(int a, int b) { return a + b; }
. What will the function call add(5, 3)
return?
What does it mean for declared functions to be 'saved for later use'?
What does it mean for declared functions to be 'saved for later use'?
What is the purpose of specifying the void
keyword as the return type of a function?
What is the purpose of specifying the void
keyword as the return type of a function?
How do you typically call a function in C++ after it has been declared?
How do you typically call a function in C++ after it has been declared?
Which part of the following function declaration specifies what the function will do? void exampleFunction() { /* code here */ }
Which part of the following function declaration specifies what the function will do? void exampleFunction() { /* code here */ }
Why are functions considered important for reusing code in programming?
Why are functions considered important for reusing code in programming?
What is the significance of the semicolon (;
) when calling a function in C++?
What is the significance of the semicolon (;
) when calling a function in C++?
Imagine you have a function int getArea(int length, int width)
. What are length
and width
?
Imagine you have a function int getArea(int length, int width)
. What are length
and width
?
If a C++ function doesn't return a value, what keyword is used to indicate this?
If a C++ function doesn't return a value, what keyword is used to indicate this?
Which of these code snippets shows the correct way to declare a function called add
that takes two integers as input?
Which of these code snippets shows the correct way to declare a function called add
that takes two integers as input?
What happens when you call a function in your C++ code?
What happens when you call a function in your C++ code?
Why is it a good practice to use functions to break down a program into smaller parts?
Why is it a good practice to use functions to break down a program into smaller parts?
Which of the following functions is an essential part of every C++ program?
Which of the following functions is an essential part of every C++ program?
If a function is defined as int myFunction(int x)
, what type of argument does it expect?
If a function is defined as int myFunction(int x)
, what type of argument does it expect?
What does the return
keyword do in a C++ function?
What does the return
keyword do in a C++ function?
You have a function declared as follows: void myFunc()
. Which action is this function designed to perform?
You have a function declared as follows: void myFunc()
. Which action is this function designed to perform?
Which of the following is the correct syntax for calling a function named displayResult
that takes no arguments?
Which of the following is the correct syntax for calling a function named displayResult
that takes no arguments?
How does using functions contribute to minimizing code duplication in a project?
How does using functions contribute to minimizing code duplication in a project?
If you define a function but forget to call it, what will be the result when you run the program?
If you define a function but forget to call it, what will be the result when you run the program?
In a function declaration, like double calculateArea(int length, int width)
, what is double
?
In a function declaration, like double calculateArea(int length, int width)
, what is double
?
What is the primary reason for using parameters when defining a function?
What is the primary reason for using parameters when defining a function?
Which of the following snippets shows the correct way to call a function named processData
that takes an integer 5
as an argument?
Which of the following snippets shows the correct way to call a function named processData
that takes an integer 5
as an argument?
Why are functions referred to as 'saved for later use'?
Why are functions referred to as 'saved for later use'?
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?
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?
What does the code inside the curly braces {}
in a function definition specify?
What does the code inside the curly braces {}
in a function definition specify?
Why is it beneficial to reuse code through functions?
Why is it beneficial to reuse code through functions?
Flashcards
What is a function?
What is a function?
A block of code that runs when it is called.
What are parameters?
What are parameters?
Data passed into a function when it is called.
What does it mean to declare a function?
What does it mean to declare a function?
To create a function by specifying its name.
How to call a function?
How to call a function?
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What is myFunction()?
What is myFunction()?
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What does void
mean?
What does void
mean?
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What does the function body do?
What does the function body do?
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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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