Module4Week1-FunctionsforOddandEven.cpp

//************************************************************************
// Author: Rolando Carreon
// Date: mar 21 2025
// Language: C++
// Assignment: Module4LabWeek1- Functions for Odd and Even
// Description: ill write multiple functions that take 2 parameters an
//              integers (less than 200 but greater than 100) and returns
//              the number of odd, even, and the sum of the odd and even
//              numbers in the range. And a program to test my function.
//************************************************************************

#include<iostream>
using namespace std;

//
// function prototypes
//

// prototypes for sum and count of all even numbers within selected range
void oddSum( int&, int&, int& );
void oddCount( int&, int&, int& );

// prototypes for sum and count of all odd numbers within selected range
void evenSum( int&, int&, int& );
void evenCount( int&, int&, int& );


int main()
{
    // declare local variables
    int lowRange;
    int highRange;
    int sum;
    int count;

    // display instructions and prompt user to enter low range number
    cout << "Please enter 2 numbers between 100 and 200\n";

    // if user enters number lower than 100 OR higher than 199, prompt again
    while (lowRange < 100 || lowRange > 199)
    {
        cout << "Enter the first number (lowest) in the (100 - 199) range: ";
        cin >> lowRange;
    }

    // prompt user to enter high range number
    // if highRange number lower than lowRange OR higher than 200, prompt again
    while (highRange < lowRange || highRange > 200)
    {
        cout << "Enter the first number (highest) in the (100 - 200) range: ";
        cin >> highRange;
    }

    // call the oddSum function, passing sum by reference
    oddSum(lowRange, highRange, sum);
    
    // call the oddSum function, passing sum by reference
    oddCount(lowRange, highRange, count);
    
    // call the oddSum function, passing sum by reference
    evenSum(lowRange, highRange, sum);
    
    // call the oddSum function, passing sum by reference
    evenCount(lowRange, highRange, count);

    return 0;
}


//
// function definitions
//

// function to add all odd numbers within the selected range together
void oddSum( int& lowRange, int& highRange, int& sum )
{
    // define local function variables
    // copies lowRange to temp value and sets sum to 0
    int next = lowRange;
    sum = 0;
    
    // checks if the temp value is odd, adds value to sum, increments to next number,
    // loops untill temp value is larger than highRange value
    while ( next <= highRange )
    {
        if ( next % 2 != 0) // if is odd
        {
            sum += next;
        }
        next++;
        
    } // end of while
    
    cout << "\nSum of all odd numbers in the range " << lowRange << " to "
         << highRange << " is " << sum << endl;
} // end of function


// function to count all times a odd number is within the selected range
void oddCount( int& lowRange, int& highRange, int& count )
{
    // define local function variables
    // copies lowRange to temp value and sets count to 0
    int next = lowRange;
    count = 0;
    
    // checks if the temp value is odd, increments the count by 1,
    // increments to next numbers, loops untill temp is larger than highRange
    while ( next <= highRange )
    {
        if ( next % 2 != 0) // if is odd
        {
            count++;
        }
        next++;
        
    } // end of while
    
    cout << "Count of all odd numbers in the range of " << lowRange
         << " to " << highRange << " is " << count << endl;
} // end of function



// function to add all even numbers within the selectedrange
void evenSum( int& lowRange, int& highRange, int& sum )
{
    // define local function variables
    // copies lowRange to temp value and sets sum to 0
    int next = lowRange;
    sum = 0;
    
    // checks if the temp value is even, adds value to sum, increments to next number,
    // loops untill temp value is larger than highRange value
    while ( next <= highRange )
    {
        if ( next % 2 == 0) // if is even
        {
            sum += next;
        }
        next++;
        
    } // end of while
    
    cout << "\nSum of all even numbers in the range " << lowRange << " to "
         << highRange << " is " << sum << endl;
} // end of function


// function to count all times a even number is within the selected range
void evenCount( int& lowRange, int& highRange, int& count )
{
    // define local function variables
    // copies lowRange to temp value and sets count to 0
    int next = lowRange;
    count = 0;
    
    // checks if the temp value is even, increments the count by 1,
    // increments to next numbers, loops untill temp is larger than highRange
    while ( next <= highRange )
    {
        if ( next % 2 == 0) // if is even
        {
            count++;
        }
        next++;
        
    } // end of while
    
    cout << "Count of all even numbers in the range of " << lowRange
         << " to " << highRange << " is " << count << endl;
} // end of function