Do While Loop in C++

 

🔄 Do While Loop in C++

The do while loop is similar to a while loop, but it executes the code block at least once, even if the condition is false.

🔹 Syntax

do {
    // Code to execute
} while (condition);

• The code executes first and then checks the condition.
• If the condition is true, the loop repeats.

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1️⃣ Printing Array using Do While Loop

📌 Print all elements of an array using a do while loop.

#include <iostream>
using namespace std;

int main() {
    int arr[] = {10, 20, 30, 40, 50};
    int size = sizeof(arr) / sizeof(arr[0]);
    int i = 0;

    do {
        cout << arr[i] << " ";
        i++;
    } while (i < size);

    return 0;
}

🔹 Output

10 20 30 40 50

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2️⃣ Printing a Given Word using Do While Loop

📌 Print a word multiple times using a do while loop.

#include <iostream>
using namespace std;

int main() {
    string word;
    int times, i = 1;

    cout << "Enter a word: ";
    cin >> word;
    cout << "How many times to print? ";
    cin >> times;

    do {
        cout << word << endl;
        i++;
    } while (i <= times);

    return 0;
}

🔹 Output

Enter a word: Hello
How many times to print? 3
Hello
Hello
Hello

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3️⃣ Printing Numbers using Do While Loop

📌 Print numbers from 1 to N using a do while loop.

#include <iostream>
using namespace std;

int main() {
    int n, i = 1;

    cout << "Enter a number: ";
    cin >> n;

    do {
        cout << i << " ";
        i++;
    } while (i <= n);

    return 0;
}

🔹 Output

Enter a number: 5
1 2 3 4 5

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📌 Summary

✔ do while executes at least once, even if the condition is false.
✔ It’s useful when user input is needed before checking conditions.
✔ while checks before execution, whereas do while checks after execution.

Would you like more examples or real-world applications? 🚀