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#include <cstdlib>
#include <iostream>
#include <fstream>

using namespace std;

void readRGB(int &, int &, int &); //Function Definitions
void RGBtoCMYK(int, int, int, float &, float &, float &, float &);
ifstream infile;

int main()

{

    int r, g, b;
    float c, m, y, k;
    float blue, green, red;



    ifstream infile("c:/colorsdot.txt"); //Reading from file

    if (!infile.is_open()) {      // Condition if the file is not open
        cout << "Error. Unable to open file.";
        system ("PAUSE");
        exit(1);
    }

        ofstream outfile("cmyk.txt");


        cout.setf(ios::fixed,ios::floatfield);
        cout.precision(1);
//infile >> red >> green >> blue;
 //readRGB(r, g, b);



        //infile >> red >> green >> blue;
        //readRGB(r, g, b);

     RGBtoCMYK( r, g, b, y, m, c, k);        // Calling the RGBtoCMYK
                               //function to caclulate the cmyk values
        outfile << y << " " << m << " " << c << " " << k << endl;
        cout << y << " " << m << " " << c << " " << k << endl;
  //readRGB(r, g, b);





    infile.close(); //closing the input file
    outfile.close(); // closing the output file

    system("PAUSE");
    return EXIT_SUCCESS;

}

void readRGB(int &r, int &g, int &b){

int red, green, blue;

  infile >> red;
  infile >> green;
  infile >> blue;


   if (red >= 0 && red <= 255)
        r = red;

        else cout << "Error invalid input" << endl;

   if (green >= 0 && green <= 255)
        g = green;

        else cout << "Error invalid input" << endl;

   if (blue >= 0 && blue <= 255)
        b = blue;

        else cout << "Error invalid input" << endl;


} //end of function readRGB


 int largest(int x, int y, int z)
{
    if (x > y && x > z)
        return x;
    else if (y > z)
    return y;
    else
    return z;

}
void RGBtoCMYK(int r, int g, int b, double &c, double &m,  double &y, double &k) // function RGBtoCMYK(r, g, b, c, m, y, k) that receives RGB values as input parameters, and returns CMYK values as reference parameters

{

    double w;



    if(r == 0 && g == 0 && b == 0) { // If the RGB values are all 0 then the CMY values are all 0 and the K value is 1

        c = 0;
        m = 0;
        y = 0;
        k = 1;

    }

    else {

        w = largest(r / 255.0, g / 255.0, b / 255.0);
        c = (w - (r / 255.0)) / w;
        m = (w - (g / 255.0)) / w;
        y = (w - (b / 255.0)) / w;
        k = 1.0 - w;

    }

}