Question

Write a C++ program that uses for loops to perform the following steps:

1. Prompt the user to input two integers: firstNum and secondNum (firstNum must be less than secondNum).

2. Output all the odd numbers between firstNum and secondNum.

3. Output the sum of all the even numbers between firstNum and secondNum.

4. Output the numbers between 1 and 10 and and their squares. (This has nothing to do with the user input.)

5. Output the sum of the square of the odd numbers between firstNum and secondNum.

6. Output all uppercase letters. (This also has nothing to do with the user input.)

Answer 1

#include <iostream>

using namespace std;

int main()
{
    int firstNum, secondNum;
    cout << "1. Input firstNum and secondNum:\n";
    cin >> firstNum >> secondNum;
    
    int sumOfEven=0, sumOfSqOdd=0;
    
    cout << "2. All odd numbers between " << firstNum << " and " << secondNum << ":\n";
    for (int i=firstNum; i<=secondNum; i++)
    {
        if (i%2==1)
        {
            cout << i << " ";
            sumOfSqOdd += i*i;
        }
        else
        {
            sumOfEven += i;
        }
    }
    cout << "\n3. Sum of evens:\n" << sumOfEven <<endl;
    cout << "4. Numbers between 1 and 10 and and their squares:\n";
    for (int i=1; i<=10; i++)
    {
        cout << i << " " << i*i << endl;
    }
    cout << "5. Sum of the square of the odd numbers:\n";
    cout << sumOfSqOdd << endl;
    cout << "6. All uppercase letters:\n";
    for (char i='A'; i<='Z'; i++)
    {
        cout << i << " ";
    }
}