Convert RGB into CMYK color. How to write progarm in C language

Question

In digital world coors are specified in RGB format,with values of R,G,B varying on integer scale from 0 to 255. In print publising the colors are mentioned in Cyan-Magenta-Yellow-Black(CMYK)format with values of C,M,Y and K varying on a real scale from 0.0 to 1.0. Write a program that converts RGB color to CMYK as per formulae:
White=Max(red/255,green/255,blue/255)
Cyan=(white-red/255)/white
Magenta=(white-green/255)/white
Yellow=(white-blue/255)/white
Black=1-white
Note that if the RGB values are all 0,then the CMY values are all 0 and the K value is 1.

Answer 1

#include <stdio.h>

int main()
{
float R,G,B;
float C,M,Y,K,W,Rf,Gf,Bf,max;
printf("Enter the values of R,G & B: ");
scanf("%f,%f,%f",&R,&G,&B);
if (R<0||R>255)
{
printf("Enter R within limit\n");
scanf("%f",&R);
}
if (G<0||G>255)
{
printf("Enter G within limits\n");
scanf("%f",&G);
}
if (B<0||B>255)
{
printf("Enter B within limits\n");
scanf("%f",&B);
}
printf("\nR,G,B: %f,%f,%f\n",R,G,B);

if (R == 0 && G == 0 && B == 0)
{
printf("\nThe value of Cyan: 0\n");
printf("\nThe value of Magenta: 0\n");
printf("\nThe value of Yellow: 0\n");
printf("\nThe value of Black: 1\n");
}
else
{
Rf = R / 255;
Gf = G / 255;
Bf = B / 255;

max = Rf;
if (max<Gf)
max = Gf;
if (max<Bf)
max = Bf;

W = max;
printf("\nWhite: %f\n\n", W);

C = (W-Rf)/W;
M = (W-Gf)/W;
Y = (W-Bf)/W;

K = 1- W;
printf("The value of Cyan: %f\n", C);
printf("The value of Magenta: %f\n", M);
printf("The value of Yellow: %f\n", Y);
printf("The value of Black: %f\n", K);
}
}