/***********************************************
 *
 * Matthew Page
 * 11/05/2014
 * CSCS1320 Fall 2014
 * 
 * logic_library.c -    Attempting to recreate
 *                      logic library from 
 *                      CSCS1240 originaly in
 *                      VBscript to C.
 *
 * ********************************************/

#include <stdio.h>

#define PREFERRED      '1'  
#define NOTPREFERRED   '0'

char input;     //originally created for single input in the case of nott 
char input1;    //written for 2 inputs like every other function
char input2;    //written for 2 inputs like every other function
char carryin;   //written for 3 inputs like fullsum and fullcarry

int newvalue;   //returned from function value

//function declarations, prototypes
char nott(char);
char andd(char, char);
char nandd(char, char);
char orr(char, char);
char xorr(char, char);
char halfsum(char, char);
char halfcarry(char, char);
char fullsum(char, char, char);
char fullcarry(char, char, char);

//nott function 
char nott(char input)
{
    if (input == PREFERRED)
    {
        return (NOTPREFERRED);
    }
    else
    {
        return PREFERRED;
    }
}

//andd function
char andd(char input1, char input2)
{
    char result;
    result = NOTPREFERRED;
    if (input1 == PREFERRED)
    {
        if (input2 == PREFERRED)
        {
            result = PREFERRED;
        }
    }
    return result;   
}

//nandd function
char nandd(char input1, char input2)
{
    char result;
    result = nott(andd(input1, input2));
}

//orr function
char orr(char input1, char input2)
{
    char result;
    result = NOTPREFERRED;
    if (input1 == PREFERRED)
    {
        result = PREFERRED;
    }
    else
    {
        if (input2 == PREFERRED)
        {
            result = PREFERRED;
        }
    }
    return result;
}

//xorr function
char xorr(char input1, char input2)
{
    char result;
    result = NOTPREFERRED;
    if (orr(input1, input2) == PREFERRED)
    {
        if (nandd(input1, input2) == PREFERRED)
        {
            result = PREFERRED;
        }
    }
    return result;
}

//halfsum function
char halfsum(char input1, char input2)
{
    char result;
    result = xorr(input1, input2);
    return result;
}

//halfcarry function
char halfcarry(char input1, char input2)
{
    char result;
    result = andd(input1, input2);
    return result;
}

//fullsum function
char fullsum(char input1, char input2, char carryin)
{
    char result;
    char firstop;
    firstop = halfsum(input1, input2);
    result = xorr(firstop, carryin);
    return result;
}

//fullcarry function
char fullcarry(char input1, char input2, char carryin)
{
    char result;
    char firstset;
    char secondset;
    char thirdset;
    char firstor;
    firstset = andd(input1, input2);
    secondset = andd(input2, carryin);
    thirdset = andd(input1, carryin);
    firstor = orr(firstset, secondset);
    result = orr(firstor, thirdset);
    return result;
}

//calling portion of the program
//(to be moved outside of this file eventually)
int main()
{
    /*
    printf("Enter a 1 or 0:\n"); //for 1 input
    scanf("%c", &input);        //for 1 input
    newvalue = nott(input);     //for 1 input
    */

    /*
    printf("Enter first value, 1 or 0:\n");     //for 2 inputs
    scanf("%c", &input1);                       //for 2 inputs
    printf("Enter second value, 1 or 0:\n");    //for 2 inputs
    scanf("%c", &input2);                       //for 2 inputs
    */

    /*
    printf("Enter 2 values (1 or 0) seperated by a space:\n");  //for 2 inputs version 2
    scanf("%c %c", &input1, &input2);                           //for 2 inputs version 2
    newvalue = halfcarry(input1, input2);            //for 2 inputs function call
    */

    printf("Enter 3 values, seperated by spaces, 2 inputs, and a carryin value (1 or 0):\n");   //for 3 inputs
    scanf("%c %c %c", &input1, &input2, &carryin);                                              //for 3 inputs                     
    newvalue = fullcarry(input1, input2, carryin);                                                //for 3 inputs

    printf("%c\n", newvalue);

    return (0);
}