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#include "stdafx.h"
#include <iostream>
#include <iomanip>
using namespace std;
int conversion(char num[128]);
void backconversion(char hex[128], int sum);
int _tmain(int argc, _TCHAR* argv[])
{
bool loop = true;
char num1[128];
char num2[128];
cout << "Enter two hexadecimal numerals to find the sum of: " << endl;
while (loop == true)
{
char exit; //User inputs value of this to exit or not
char hexnum[128];//Hex Numeral input by user
int value1 = 0;
int value2 = 0;
int sum;
int limit = 0;
do
{
if (value1 == -1) //Function has detected non hex char
{
cout << "That is an invalid hexadecimal character, retry:" << endl;
}
cout << "1: ";
cin >> num1;
value1 = conversion(num1); //Conversion call
} while (value1 == -1);
cout << "+" << endl;
do
{
if (value2 == -1) //Function has detected non hex char
{
cout << "That is an invalid hexadecimal character, retry:" << endl;
}
cout << "2: ";
cin >> num2;
value2 = conversion(num2); //Conversion Call
} while (value2 == -1);
sum = value1 + value2;
// Counts digit in sum
int count = 0;
while (sum != 0) {
count++;
sum /= 10;
}
// If digits in sum are less than 128
if (count < 129)
{
sum = value1 + value2;
backconversion(hexnum, sum);
cout << value1 << " + " << value2 << " = " << sum << "\t" << "Sum in Hex: ( ";
while (static_cast<int>(hexnum[limit]) != -52 && static_cast<int>(hexnum[limit]) != 0)
{
cout << hexnum[limit];
limit++;
}
cout << " )" << endl;
}
else
{
cout << "Addition Overflow" << endl;
}
// Wipes sum to hex conversion array
for (int i = 0; i < limit; i++)
{
hexnum[i] = 0;
}
cout << "Would you like to exit (y/n): ";
cin >> exit;
if (exit == 'y')
{
loop = false;
}
}
return 0;
}
int conversion(char num[128])
{
int key[16] = { 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 65, 66, 67, 68, 69, 70 }; //Key to reference to
int alphabetic; //The result of IsAlpha for comparison
int pool = 0; //Result of conversion
int characters = 0; //Used to find number of useable characters in array
int power; //Used to determine what multiple of 16 the number is a multiple of
int count = 0; //Constrains for loops, basically the static version of characters
int valid = 0; //Used to check determine if valid hex
//Conversion for number
while (static_cast<int>(num[count]) != -52 && static_cast<int>(num[count]) != 0)
{
characters++;
count++;
}
for (int i = 0; i < count; i++)
{
power = 1;
//Checks to see if char is alpha and changes to uppercase for recognition if so
if (static_cast<int>(num[i]) != -52)
{
alphabetic = isalpha(num[i]);
if (alphabetic != 0)
{
num[i] = toupper(num[i]);
}
}
else
{
break;
}
//Compares character ASCII values to the ones defined in the array to see if any match and adds corresponding number to sum
for (int a = 0; a < 16; a++)
{
if (static_cast<int>(num[i]) == key[a])
{
valid++;
//Calculates what the value of the number's place is and adds to relative pool
if (characters - 1 != 0)
{
power = 16;
}
for (int p = 1; p < characters - 1; p++)
{
power *= 16;
}
pool += (a * power);
characters--;
break;
}
}
}
// If valid is equal to characters in char array
if (valid != count)
{
return -1;
}
return pool;
}
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