Why loops are needed in C++ - See It in Action

Why loops are needed

📖 Scenario: Imagine you have a list of 5 friends and you want to say "Hello" to each one. Writing the same line again and again is tiring and takes a lot of space. Loops help us repeat actions easily without writing the same code many times.

🎯 Goal: You will create a simple program that stores 5 friend names and uses a loop to greet each friend by printing "Hello, <friend>!".

📋 What You'll Learn

Create an array of 5 friend names

Create a variable to count how many friends there are

Use a for loop to go through each friend in the array

Print a greeting message for each friend

💡 Why This Matters

🌍 Real World

Loops are used in many programs to handle repeated tasks like processing lists of data, automating repetitive actions, and managing user inputs.

💼 Career

Understanding loops is essential for any programming job because they make code efficient and easier to maintain when working with collections of data.

1

Create an array of friend names

Create a string array called friends with these exact names: "Alice", "Bob", "Charlie", "Diana", "Ethan".

C++

#include 
#include 

int main() {

    // Create the array of friends
    // Your code here

    return 0;
}

Need a hint?

Use std::string friends[5] = {"Alice", "Bob", "Charlie", "Diana", "Ethan"}; to create the array.

2

Create a variable for the number of friends

Create an int variable called count and set it to 5 to store the number of friends.

C++

#include 
#include 

int main() {
    std::string friends[5] = {"Alice", "Bob", "Charlie", "Diana", "Ethan"};

    // Create the count variable
    // Your code here

    return 0;
}

Need a hint?

Use int count = 5; to store the number of friends.

3

Use a for loop to greet each friend

Use a for loop with int i = 0; loop while i < count; and increase i by 1 each time. Inside the loop, print "Hello, " followed by friends[i] and then "!".

C++

#include 
#include 

int main() {
    std::string friends[5] = {"Alice", "Bob", "Charlie", "Diana", "Ethan"};
    int count = 5;

    // Use a for loop to greet each friend
    // Your code here

    return 0;
}

Need a hint?

Use a for loop with i from 0 to count - 1 and print the greeting inside.

4

Print the greetings

Run the program to print the greetings for all friends. The output should show each friend greeted on a new line.

C++

#include 
#include 

int main() {
    std::string friends[5] = {"Alice", "Bob", "Charlie", "Diana", "Ethan"};
    int count = 5;

    for (int i = 0; i < count; i++) {
        std::cout << "Hello, " << friends[i] << "!" << std::endl;
    }

    // Run the program to see the output
    // Your code here

    return 0;
}

Need a hint?

Run the program and check the output matches the greetings for all friends.