//Author:
//File:  HexCalculator.cpp

/*    
--Purpose--
×Create a hexidecimal calculator that can:
1.  Perform the mathematical operation addition
2.  Perform the mathematical operation subtraction
3.  Perform the mathematical operation multiplication
4.  Perform the mathematical operation division
5.  Convert a hexadecimal number to it's decimal equivalent
6.  Convert a decimal number to it's hexadecimal equivalent
*/

//enum for operations
#include <iostream>
#include <cctype>
#include <string>
using namespace std;

enum MenuType {ADD, SUBTRACT, MULTIPLY, DIVIDE, HEX_TO_DECIMAL, DECIMAL_TO_HEX, QUIT};

//function prototype
MenuType GetMenuPick();
string GetHex();
void Add();
void Subtract();
void Multiply();
void Divide();
int ConvertFromDecimal(string);
string ConvertFromHex(int);
void InvalidHex();
void OperationSelector(MenuType);


int main()
{
    MenuType choice;
    choice = GetMenuPick();

    OperationSelector(choice);

}


MenuType GetMenuPick()
{
    char choice;

    cout << "HEXIDECIMAL CALCULATOR\n\n\n\n";

    cout << "Please Select one of the following options\n"
        << "A for addition\n"
        << "S for subtraction\n"
        << "M for multiplication\n"
        << "D for division\n"
        << "C to convert a hexidecimal number to its decimal equivalent\n"
        << "H to convert a decimal number to its hexidecimal equivalent\n"
        << "Q to exit the program\n";

    cin >> choice;
    choice = toupper(choice);

    switch(choice)
    {
    case 'A':  
        {
            system("cls");
            return ADD;
            break;
        }
    case 'S':
        {
            system("cls");
            return SUBTRACT;
            break;
        }
    case 'M':
        {
            system("cls");
            return MULTIPLY;
            break;
        }
    case 'D':
        {
            system("cls");
            return DIVIDE;
            break;
        }
    case 'C':
        {
            system("cls");
            return HEX_TO_DECIMAL;
            break;
        }
    case 'H':
        {
            system("cls");
            return DECIMAL_TO_HEX;
            break;
        }
    case 'Q':
        {
            return QUIT;
            break;
        }
    default:
        {
            cout << "Im sorry, the option you selected is invalid.\n"
                << "Please try again.\n";
            system("pause");
            system("cls");
            GetMenuPick();
            break;
        }

    }
}

void OperationSelector(/*in*/ MenuType choice)
{
    while(choice != 'Q')
    {
        switch(choice)
        {
        case ADD:
            {
                cout << "adddition" << endl;
                system("pause");
                system("cls");
                choice = GetMenuPick();
                break;
            }
        case SUBTRACT:
            {
                cout << "subtract" << endl;
                system("pause");
                system("cls");
                choice = GetMenuPick();
                break;
            }
        case MULTIPLY:
            {
                cout << "subtract" << endl;
                system("pause");
                system("cls");
                choice = GetMenuPick();
                break;
            }
        case DIVIDE:
            {
                cout << "subtract" << endl;
                system("pause");
                system("cls");
                choice = GetMenuPick();
                break;
            }
        case HEX_TO_DECIMAL:
            {
                cout << "subtract" << endl;
                system("pause");
                system("cls");
                choice = GetMenuPick();
                break;
            }
        case DECIMAL_TO_HEX:
            {
                cout << "subtract" << endl;
                system("pause");
                system("cls");
                choice = GetMenuPick();
                break;
            }



        }
    }
}
void Add()
{
    int decimalhex1;
    int decimalhex2;
    int intsum;
    string stringhex1;
    string stringhex2;
    string stringsum;

    stringhex1 = GetHex();
    stringhex2 = GetHex();
    decimalhex1 = ConvertFromHex(stringhex1);
    decimalhex2 = ConvertFromHex(stringhex2);
    intsum = decimalhex1 + decimalhex2;
    stringsum = ConvertFromDecimal(intsum);

    cout << stringhex1 << " + " << stringhex2 << " =   " << stringsum << endl;
}
string GetHex()
{
    string hexnum;

    cout << "Enter a hexadecimal number:   " << endl;
    cin >> hexnum;
    return hexnum;
}
int ConvertFromHex(/*in*/ string hex1)
{
}
string ConvertFromDecimal(/*in*/ int num)
{

}





void Subtract();
void Multiply();
void Divide();
void ToDecimal();
void ToHex();

char szTest [512];

for (int x = 0; x < 512; x++)
{
cout << szTest [x]; //something like that..
}