Do–while loop in C++ - Mini Project: Build & Apply

Using a Do–while Loop in C++

📖 Scenario: You are creating a simple program that asks a user to enter a number repeatedly until they enter zero. This simulates a real-life situation where you keep asking for input until a stop condition is met.

🎯 Goal: Build a C++ program that uses a do–while loop to keep asking the user for a number and stops when the user enters 0.

📋 What You'll Learn

Create an integer variable called number to store user input.

Use a do–while loop to ask the user to enter a number.

Continue looping until the user enters 0.

Print the entered number each time inside the loop.

Print "Done!" after the loop ends.

💡 Why This Matters

🌍 Real World

Do–while loops are useful when you want to run a block of code at least once and then repeat it based on a condition, such as menu selections or repeated user input.

💼 Career

Understanding loops like do–while is essential for programming tasks that require repeated actions, common in software development, data processing, and user interface design.

1

Create the variable to store user input

Create an integer variable called number and set it to 0.

C++

int number = 0;  // Your code here

Need a hint?

Use int number = 0; to create the variable.

2

Set up the do–while loop structure

Add a do block and a while condition that checks if number is not equal to 0.

C++

#include 

int main() {
    int number = 0;
    do {
        // Your code here
    } while (number != 0);
    return 0;
}

Need a hint?

Use do { ... } while (number != 0); to create the loop.

3

Add input and output inside the loop

Inside the do block, use std::cout to ask the user to enter a number, then use std::cin to read the input into number. After reading, print the entered number using std::cout.

C++

#include 

int main() {
    int number = 0;
    do {
        // Ask for input and print the number
        // Your code here
    } while (number != 0);
    return 0;
}

Need a hint?

Use std::cout and std::cin inside the do block to get and show the number.

4

Print a message after the loop ends

After the do–while loop, add a std::cout statement to print "Done!".

C++

#include 

int main() {
    int number = 0;
    do {
        std::cout > number;
        std::cout << "You entered: " << number << std::endl;
    } while (number != 0);
    // Print "Done!" here
    // Your code here
    return 0;
}

Need a hint?

Use std::cout << "Done!" << std::endl; after the loop.