Input and output using cin and cout in C++ - Mini Project: Build & Apply

Input and output using cin and cout

📖 Scenario: You are creating a simple program that asks a user for their name and age, then shows a greeting message with that information.

🎯 Goal: Build a program that reads a user's name and age using cin and then prints a greeting message using cout.

📋 What You'll Learn

Use string to store the user's name

Use int to store the user's age

Use cin to get input from the user

Use cout to display the greeting message

💡 Why This Matters

🌍 Real World

Getting input from users and showing messages is the first step in making interactive programs like games, calculators, or forms.

💼 Career

Understanding basic input and output is essential for any programming job because it helps you communicate with users and test your programs.

1

Create variables for name and age

Create a string variable called name and an int variable called age.

C++

#include 
#include 

using namespace std;

int main() {

    // Create variables 'name' and 'age' here
    // Your code here

    return 0;
}

Need a hint?

Use string name; and int age; inside main().

2

Read user input for name and age

Use cin to read the user's name into name and the user's age into age.

C++

#include 
#include 

using namespace std;

int main() {
    string name;
    int age;

    // Use cin to get input for name and age
    // Your code here

    return 0;
}

Need a hint?

Use cin >> name >> age; to read both values.

3

Print a greeting message

Use cout to print the message: Hello, <name>! You are <age> years old. Use the variables name and age in the message.

C++

#include 
#include 

using namespace std;

int main() {
    string name;
    int age;

    cin >> name >> age;

    // Use cout to print the greeting message
    // Your code here

    return 0;
}

Need a hint?

Use cout << "Hello, " << name << "! You are " << age << " years old." << endl;.

4

Run the program and see the output

Run the program and enter Alice for the name and 30 for the age. The program should print: Hello, Alice! You are 30 years old.

C++

#include 
#include 

using namespace std;

int main() {
    string name;
    int age;

    cin >> name >> age;

    cout << "Hello, " << name << "! You are " << age << " years old." << endl;

    // Run the program and check output
    // Your code here
}

Need a hint?

Type Alice then 30 when the program asks for input.