Question

Practical 3 (while loop)
Write a program that uses while loops to perform the following steps:
a. Prompt the user to input two integers: firstNum and secondNum
(firstNum must be less than secondNum).
b. Output all odd numbers between firstNum and secondNum.
c. Output the sum of all even numbers between firstNum and secondNum.
d. Output the numbers and their squares between 1 and 10.
e. Output the sum of the square of the odd numbers between firstNum and secondNum.
f. Output all uppercase letters.

Answer 1

#include <iostream>
using namespace std;


int main()
{
    //a. Prompt the user to input two integers: firstNum and secondNum
    //(firstNum must be less than secondNum).
    cout << "a. Prompt the user to input two integers. First must be less than second\n";
    double firstNum = 2;
    double secondNum = 1;


    while (firstNum > secondNum)
    {
       cout << "enter first number: \n";
       cin >> firstNum;
       cout << "enter second number (must be more than first number): \n";
       cin >> secondNum;


       if (firstNum > secondNum) 
           cout << "first number must be less than second number. Try again. \n";
    }
    cout << "\n";


    //b. Output all odd numbers between firstNum and secondNum.
    cout << "b. Output all odd numbers between firstNum and secondNum.\n";
    int number = firstNum;


    while (number <= secondNum)
    {
        if (number % 2)
            cout << number++ << "\n";
        else
        {
            number++;
            continue;
        }
    }
    cout<<"\n";


    //c. Output the sum of all even numbers between firstNum and secondNum.
    cout << "c. Output the sum of all even numbers between firstNum and secondNum.\n";
    number = firstNum;
    int sum = 0;


    while (number <= secondNum)
    {
        if (!(number % 2))
            sum += number++;
        else
        {
            number++;
            continue;
        }
    }
    cout << "sum = " << sum << "\n\n";


    //d. Output the numbers and their squares between 1 and 10.
    cout << "d.Output the numbers and their squares between 1 and 10.\n";
    number = 1;
    while (number <= 10)
    {
        cout << number << " -> " << number << "^2" << " = " << number * number << '\n';
        number++;
    }
    cout << "\n";


    //e. Output the sum of the square of the odd numbers between firstNum and secondNum.
    cout << "Output the sum of the square of the odd numbers between firstNum and secondNum\n";
    number = firstNum;
    sum = 0;
    while (number <= secondNum)
    {
        if (number % 2)
        {
            sum += (number * number);
            number++;
        }
        else
        {
            number++;
            continue;
        }
    }
    cout << "sum: " << sum << "\n\n";


    //f. Output all uppercase letters.
    cout << "Output all uppercase letters.\n";
    int c = 65;


    while (c < 91)
        cout << char(c++) << ", ";
    cout << "\n";
}