CS136 Lab2 [4]

//Lab 2 Wilson, Drayden T Th

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

using namespace std;

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] Raise a number n to the xth power.\n"
            << "[2] Display the sum of the squares for the first n terms of a series.\n"
            << "[3] Display the sum of the squares for the first n terms of a series, in reverse.\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 1:
            PrintExponentiatedValue();
            break;
        case 2:
            PrintSeries();
            break;
        case 3:
            PrintSeriesReverse();
            break;
        case 4:
            cout << "Exiting program.\n\n";
            break;
        default:
            cout << "Invalid menu option selected.\n";
            userMenuSelection = 1; //avoids repeating initial instructions
            break;
        }
    } while (userMenuSelection != 4);

    system("pause");
    return 0;
}

void PrintExponentiatedValue(void)
{
    int userValue, userExponent;

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

    if (userExponent >= 0)
    {
        printf("%d to the power of %d: %d\n", userValue, userExponent, ExponentiateValue(userValue, userExponent));
    }
    else
    {
        printf("%d to the power of %d: %.2f\n", userValue, userExponent, 1.0 / ExponentiateValue(userValue, abs(userExponent)));
    }
}

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?~~~~~~~~~~~~~~~~~~~~~~~~~~~
    }
}

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 || base == 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) /////make sure input is positive
{
    int currentSum;

    if (currentVal == 1) //base case
    {
        cout << currentVal;
        return currentVal * currentVal;
    }
    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;
    }
}