conversion programm

[neborah]

im having trouble with the hex 2 dec conversion ... all the others work
heres my code

// bianary converter sample.cpp : Defines the entry point for the console application.
#include <iostream>
#include <cmath>
#include <iomanip>
#include <string>

using namespace std;

void decToBin( int, int );
void convert (int); 
void change (string, int);
int main()
{
	string hexiNum = "";
	int num = 0;
	int num2 = 0;
	int decimalVal = 0;
	int total = 0;
	// Creating a variable of type integer
	int decimal;
 
	// message to the user to input his age
	cout << "Enter a Decimal Integer to convert it to binary: ";
	cin >> decimal; // save it to the varible
 
	cout << "\nIn Binary is: ";
 
	decToBin( decimal, 2 ); // calling the function to convert to binary
 
	cout << endl; // output a newline
	cout <<"in hex: " << hex << decimal << endl;
	cout << "_____________________________________________________________________" << endl;
	cout << endl;
	// binary to decimal
	

	

	cout << "Enter a binary integer (0 to quit): ";
	    cin >> num2;
		int temp = num2;
	     
	    cout << "\nconverted to decimal is : ";
	    convert (num2);
	cout << endl;
	
	
	cout << "_____________________________________________________________________" << endl;
	cout << endl;
	//hex to decimal and bianary
	
	cout << "Enter a hexadecimal: ";
	cin >> hexiNum;
	cout << hexiNum << " In decimal form is: " << total << endl;

	change(hexiNum, total);
	
	
	system ("pause");
	return 0;
} // end main
 
 
// a recursive function to find the binary of an integer
void decToBin(int num, int base)
{
 
	 if (num > 0)
	{
		decToBin(num/base, base);
		cout<< num % base;
 
	}
 
} // end function decToBin
void convert (int binary)
	{
	    int hold = 1;
	    int final = 0;
	     
	    while (binary != 0)
	    {
	        if (binary % 2 == 1)
	        {
	            binary = (binary-1)/10;
	            final += hold;
	        }
	         
			else if (binary % 2 == 0)
	        {
	            binary = binary/10;
	        }
	        hold *= 2;
	    }
	    cout <<  dec << final << endl;
		cout<< "In hex: " << hex << final << endl;
	}

void change (string hexiNum, int total)
{
	char x = ' ';
	char x2 = ' ';
	int val = 0;
	int numeric = 0;
	int number = 0;
	int number2 = 0;
	int numeric2 = 0;
	

		if (isalpha(hexiNum.at(0)))
		{
			x = hexiNum.at(0);
			toupper('x');
			if (x == 'A')
			{
				number = 160;
			}
			else if (x == 'B')
			{
				number = 176;
			}
			else if (x == 'C')
			{
				number = 192;
			}
			else if (x == 'D')
			{
				number = 208;
			}
			else if (x == 'E')
			{
				number = 224;
			}
			else if (x == 'F')
			{
				number = 240;
			}
		}
		else if (isalnum(hexiNum.at(0)))
		{
			numeric = hexiNum.at(0);
			
			if (numeric == 0)
			{
				number = 0;
			}
			else if (numeric == 1)
			{
				number = 16;
			}
			else if (numeric == 2)
			{
				number = 32;
			}
			else if (numeric == 3)
			{
				number = 48;
			}
			else if (numeric == 4)
			{
				number = 64;
			}
			else if (numeric == 5)
			{
				number = 80;
			}
			else if (numeric == 6)
			{
				number = 96;
			}
			else if (numeric == 7)
			{
				number = 112;
			}
			else if (numeric == 8)
			{
				number = 128;
			}
			else if (numeric == 9)
			{
				number = 144;
			}
			
		}
		
		
		
		if (isalpha(hexiNum.at(1)))
		{
			x2 = hexiNum.at(0);
			toupper('x2');
			
			if (x2 == 'A')
			{
				number2 = 160;
			}
			else if (x2 == 'B')
			{
				number2 = 176;
			}
			else if (x2 == 'C')
			{
				number2 = 192;
			}
			else if (x2 == 'D')
			{
				number2 = 208;
			}
			else if (x2 == 'E')
			{
				number2 = 224;
			}
			else if (x2 == 'F')
			{
				number2 = 240;
			}
		}
		else if (isalnum(hexiNum.at(1)))
		{
				number2 = hexiNum.at(1);
		}
			

		
		cout << x << endl;
		cout << x2 << endl;
		cout << number << endl;
		cout << number2 << endl;

		total = (number + number2);
}