Input and output using cin and cout in C++ - Cheat Sheet & Quick Revision

Recall & Review

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What is cin used for in C++?

cin is used to take input from the user through the keyboard.

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What does cout do in C++?

cout is used to display output on the screen.

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How do you include the library needed for cin and cout?

You include the <iostream> library at the top of your program using #include <iostream>.

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What symbol is used with cout to send output?

The insertion operator << is used to send output to cout.

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How do you read an integer value from the user using cin?

Declare an integer variable, then use cin >> variableName; to read the value.

Which header file must be included to use cin and cout?

A #include <vector>

B #include <stdio.h>

C #include <string>

D #include <iostream>

cin and cout are part of the iostream library.

What operator is used to get input from the user with cin?

A <<

B >>

C +=

D ==

The extraction operator >> is used with cin to read input.

How do you print the text "Hello" using cout?

A cout << "Hello";

B cout >> "Hello";

C cin << "Hello";

D print("Hello");

Use cout << "Hello"; to display text.

What will this code do?<br>

int x; cin >> x;

A Read a value from the user and store it in x

B Cause a syntax error

C Declare x as a string

D Print the value of x

This code reads a value from the user and stores it in the integer variable x.

Which of these is the correct way to output multiple items?<br>

cout << "Age: " << age << endl;

A Wrong, use plus signs instead

B Wrong, use commas instead

C Correct

D Wrong, use semicolons instead

Using multiple << operators in a row is the correct way to output multiple items.

Explain how to take an integer input from the user and then print it using cin and cout.

Think about the steps from declaring a variable to showing it on screen.

Describe the role of the operators >> and << in C++ input and output.

Focus on what each operator does with cin and cout.