Loops examples in C++ Language Here are some Loops examples in C++ Language Working with For Loops Counting from 1 to 5: #include <iostream>using namespace std;int main() {for (int i = 1; i <= 5; i++) {cout<< i << " ";}cout<< endl;return 0;} • The ' for ' loop starts with ' i ' set to 1.• It continues as long as ' i ' is less than or equal to 5.• In each iteration, it prints the value of ' i ' and increments it. Printing Even numbers up to 10: #include <iostream>using namespace std;int main() {for (int i = 2; i <=10; i+=2) {cout<< i << " ";}cout<< endl;return 0;} • The for loop starts with ' i ' set to 2.• It continues as long as ' i ' is less than or equal to 10.• In each iteration, it prints the value of ' i ' (even numbers) and increments ' i ' by 2. Counting Down from 5 to 1: #include <iostream>using namespace std;int main() {for(int i = 5; i >= 1; i--) {cout<< i << " ";}cout<< endl;return 0;} • The ' for ' loop starts with ' i ' set to 5.• In continues as long as ' i ' is greater than or equal to 1.• In each iteration, it prints the value of ' i ' and decrements it. Working with While Loops User Input Validation: #include <iostream>using namespace std;int main() {int age;cout<< "Enter your age (between 18 and 99) : ";cin>> age;while (age < 18 || age > 99) {cout<< "Ivalid age. Please enter a valid age between 18 and 99 : ";cin>> age;}cout<< "Valid age entered : " << age << endl;return 0;} • The ' while ' loop ensure that the user enters a valid age between 18 and 99.• If the entered age is invalid, it prompts the user to enter a valid age. Power of 2 Series: #include <iostream>using namespace std;int main() {int power = 1;int exponent = 0;cout<<" Power of 2 series up to 8 : ";while (exponent <= 8) {cout<<power << " " ;power *= 2;++exponent;}cout<<endl;return 0;} • The ' while ' loop generates a series of power of 2 up to 2^8.• It starts with ' power ' set to 1 and ' exponent ' set to 0.• In each iteration, it prints the current value of ' power ' , multiplies ' power ' by 2, and increments the ' exponent '.• The loop continues until the ' exponent ' reaches 8. Guess the Number Game: #include <iostream>#include <cstdlib>#include <ctime>using namespace std;int main() {srand(time(0));int secretNumber = rand() % 100 + 1;int guess;int attempts = 0;cout<< "Welcome to the Guess the Number Game!" <<endl;while (true) {cout<< "Enter your guess (between 1 and 100) : ";cin>> guess;++attempts;if (guess == secretNumber) {cout<< "Congratulations! You guessed the number in " <<attempts << " attempts. " <<endl;break;} else if (guess < secretNumber) {cout<< " Too low. Try again." <<endl;} else {cout<< " Too high. Try again." <<endl;}}return 0;} • The ' while ' loop continues until the user correctly guesses the random ' secretNumber ' .• It generates a random number between 1 and 100 using ' rand() % 100 + i ' .• The user is prompted to enter a guess, and the program provides feedback (too low, too high) based on the comparison with secret number.• The loop exits when the user correctly guesses the number, and the total number of attempts is displayed. Working with Do While Loops Even Number Up to 10: #include <iostream>using namespace std;int main() {int evenNumber = 2;do {cout<< evenNumber << " ";evenNumber += 2;} while (evenNumber <= 10);cout<< endl;return 0;} • The ' do-while ' loop prints numbers from 1 to 5.• It starts with ' number ' set to 1 .• Inside the loop , it prints the current value of ' number ' and increments it .• The loop continues until ' number ' is less than or equal to 5 . Factorial Calculation: #include <iostream>using namespace std;int main() {int n, factorial = 1;cout<< " Enter a positive integer : " ;cin>> n;if (n < 0) {cout<< " Please enter a non-negative integer. " << endl;return 1;}do {factorial *= n;--n;} while (n > 0);cout<< " Factorial: " << factorial << endl;return 0;} • The program calculates the factorial of a given positive intefer ('n') .• The ' do-while ' loop continues as long as ' n ' is greater than 0 .• In each iteration , it multiplies ' factorial ' by ' n ' and then decrements ' n ' .• The loop repeats until ' n ' becomes 0 , resulting in the calculation of the factorial . Guess the number Game (with Replay Option): #include <iostream>#include <cstdlib>#include <ctime>using namespace std;int main() {srand(time(0));char playAgain;do {int secretNumber = rand() % 100 + 1;int guess;int attempts = 0;cout<< " Welcome to the Guess the Number Game! " << endl;do {cout<< " Enter your guess (between 1 and 100) : ";cin>> guess;++attempts;if(guess == secretNumber) {cout<< " Congratulations! You guessed the number in " << attempts << " attempts. " <<endl;} else if (guess < secretNumber) {cout<< " Too low. Try again. " <<endl;} else {cout<< " Too high. Try again. " <<endl;}} while (guess != secretNumber);cout<< " Do you want to play again> (y/n) : ";cin>> playAgain;} while (playAgain == 'y');cout<< " Thanks for playing! " <<endl;return 0;} • The outer ' do-while ' loop allows the player to replay the game.• Inside the outer loop, there is an inner ' do-while ' loop for the number guessing game.• The player is prompted to enter guesses until they correctly guess the randomly generated ' secretNumber ' .• After each game, the player is asked if they want to play again. If ' y ' is entered, the game restarts. Otherwise, the program exits.
