commit 9eb14cc2ad4d4d37d10f5eb85765f60f4667d415
parent 601ef51ba71c79849a9a93d72f688988d28acae4
Author: Amit Dutta <amitdutta4255@gmail.com>
Date: Sat, 4 Oct 2025 14:38:52 +0530
add luc020.c
Diffstat:
1 file changed, 64 insertions(+), 0 deletions(-)
diff --git a/letusc-exercises/luc020.c b/letusc-exercises/luc020.c
@@ -0,0 +1,63 @@
+/* In digital world colors are specified in Red-Green-Blue (RGB) format,
+with values of R, G, B varying on an integer scale from 0 to 255. In print
+publishing 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 color as per the following 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. */
+/* Author - Amit Dutta, Date - 4rd OCT, 2025 */
+/* Let Us C, Chap- 4, Page - 71, Qn No.: D(b) */
+
+#include <stdio.h>
+
+// declaring function
+double get_white(double red, double green, double blue)
+{
+ double max;
+ max = red / 255;
+ if (max < (green / 255))
+ max = green / 255;
+ if (max < (blue / 255))
+ max = blue / 255;
+ return max;
+}
+
+int main()
+{
+ double r, g, b, w, c = 0, m = 0, y = 0, k = 0;
+ printf("Enter the RGB color code in 'R G B' format : ");
+ scanf("%lf %lf %lf", &r, &g, &b);
+
+ // checking for invalid input (negetive input)
+ if (r < 0 || g < 0 || b < 0)
+ {
+ printf("\nRGB color code can not be a negetive number.");
+ return 1;
+ }
+
+ // checking for invalid input (out of range color code)
+ if (r > 255 || g > 255 || b > 255)
+ {
+ printf("\nRGB color code can be maximum (255, 255, 255).");
+ return 1;
+ }
+
+ // converting RGB color code to CMYK color code
+ if (r == 0 && g == 0 && b == 0)
+ k = 1;
+ else
+ {
+ w = get_white(r, g, b);
+ c = (w - (r / 255)) / w;
+ m = (w - (g / 255)) / w;
+ y = (w - (b / 255)) / w;
+ k = 1 - w;
+ }
+
+ printf("\nRGB color (%g, %g, %g) equivalent to CMYK color (%g, %g, %g, %g).", r, g, b, c, m, y, k);
+ return 0;
+}+
\ No newline at end of file
