c
28 			do {
29 				horizSubSampling = atoi(optarg);
30 				if (horizSubSampling == 0) {
31 					fprintf(stderr, "Error: Horizontal subsampling must be a non-zero value. Please enter again: ");
32 					// Reprompt for input (consider using fgets for better input control)
33 				}
34 			} while (horizSubSampling == 0);
