CS136 lab2 [Turn in]

// Lab 2 Wilson, Drayden T Th

#include <iostream>
#include <string>
#include <cmath>

using namespace std;

enum MenuOption { INVLAID = 0, EXPONENTIATE, SERIES, SERIES_REVERSE, EXIT };

void PrintExponentiatedValue(void);
void PrintSeries(void);
void PrintSeriesReverse(void);
int ExponentiateValue(int base, int exponent);
int PrintSumOfSquaresSeries(int currentVal, int initialVal);
int PrintSumOfSquaresSeriesReverse(int currentVal, int initialVal);

int main(void)
{
    int userMenuSelection = 0;

    do
    {
        cout << "\n [1] Exponentiate\n"
             << " [2] Series\n"
             << " [3] Series Reversed\n"
             << " [4] Exit.\n\n";

        if (userMenuSelection)
        {
            cout << " Select another option: ";
        }
        else
        {
            cout << " Select an option by entering its corresponding number: ";
        }

        cin >> userMenuSelection;

        switch (userMenuSelection)
        {
        case EXPONENTIATE:
                PrintExponentiatedValue();
                break;
        case SERIES:
                PrintSeries();
                break;
        case SERIES_REVERSE:
                PrintSeriesReverse();
                break;
        case EXIT:
                cout << " Exiting program.\n\n";
                break;
        default:
                cout << " Invalid menu option selected.\n";
                userMenuSelection = 1; // 1 == !INVALID
                break;
        }
    } while (userMenuSelection != EXIT);

    system("pause");
    return 0;
}

// Menu Option 1 [EXPONENTIATE]
void PrintExponentiatedValue(void)
{
    int userBase, userExponent;

    cout << " Enter a base value: ";
    cin  >> userBase;
    cout << " Enter an exponent: ";
    cin  >> userExponent;

    if (userExponent >= 0) // positive exponents
    {
        printf(" %d to the power of %d: %d\n", userBase, userExponent
                , ExponentiateValue(userBase, userExponent));
    }

    else if (userBase != 0) // negative exponents, nonzero base
    {
        printf(" %d to the power of %d: %f\n", userBase, userExponent
                , 1.0 / ExponentiateValue(userBase, abs(userExponent)));
    }
    else // negative exponents, zero base
    {
        printf(" %d to the power of %d: undefined\n", userBase, userExponent);
    }
}

// Menu Option 2 [SERIES]
void PrintSeries(void)
{
    int userValue;

    cout << " Enter the desired length for the series: ";
    cin  >> userValue;

    if (userValue < 1)
    {
        cout << " Value must be positive.\n";
    }
    else
    {
        printf(" First %d elements of the series of squares: ", userValue);
        int dummy = PrintSumOfSquaresSeries(userValue, userValue);
        // is function meant to handle ENTIRE output?~~~~~~~~~~~~~~~~~~~~~~~~~~
    }
}

// Menu Option 3 [SERIES_REVERSE]
void PrintSeriesReverse(void)
{
    int userValue;

    cout << " Enter the desired length for the series: ";
    cin  >> userValue;

    if (userValue < 1)
    {
        cout << " Value must be positive.\n";
    }
    else
    {
        printf(" First %d elements of the series of squares in reverse: ", userValue);
        int dummy = PrintSumOfSquaresSeriesReverse(1, userValue);
        // is function meant to handle ENTIRE output?~~~~~~~~~~~~~~~~~~~~~~~~~
    }
}

// Calculates base^exponent
// pre: base and exponent are defined; exponent is positive
// post: base^exponent is returned
int ExponentiateValue(int base, int exponent)
{
    if (exponent == 0)
    {
        return 1;
    }
    else
    {
        return base * ExponentiateValue(base, exponent - 1);
    }
}

// Prints the series of squares up to a given number of elements and the sum of said series
// pre: currentVal and actualVal are defined, positive, and equivalent
// post: Series and its sum have been printed
int PrintSumOfSquaresSeries(int currentVal, int initialVal)
{
    int currentSum;

    if (currentVal == 1) // base case
    {
        cout << currentVal;
        return 1;
    }
    else if (currentVal == initialVal) // initial case
    {
        currentSum = (currentVal * currentVal) + PrintSumOfSquaresSeries(currentVal - 1, initialVal);
        printf("+(%d*%d)=%d\n", currentVal, currentVal, currentSum);
        return currentSum;
    }
    else // general case
    {
        currentSum = (currentVal * currentVal) + PrintSumOfSquaresSeries(currentVal - 1, initialVal);
        printf("+(%d*%d)", currentVal, currentVal);
        return currentSum;
    }
}

// Prints the series of squares up to a given number of elements and the sum of said series, in reverse
// pre: currentVal is 1; actualVal is defined and positive
// post: Series and its sum have been printed
int PrintSumOfSquaresSeriesReverse(int currentVal, int initialVal)
{
    int currentSum;

    if (currentVal == initialVal) // base case
    {
        printf("(%d*%d)", currentVal, currentVal);
        return currentVal * currentVal;
    }
    else if (currentVal == 1) // initial case
    {
        currentSum = (currentVal * currentVal) + PrintSumOfSquaresSeriesReverse(currentVal + 1, initialVal);
        printf("+%d=%d\n", currentVal, currentSum);
        return currentSum;
    }
    else // general case
    {
        currentSum = (currentVal * currentVal) + PrintSumOfSquaresSeriesReverse(currentVal + 1, initialVal);
        printf("+(%d*%d)", currentVal, currentVal);
        return currentSum;
    }
}