Code:

printf("--------------------------------------------------------------------------\n");
    printf("- Settings - \n");
    printf("--------------------------------------------------------------------------\n");
    printf("\tStart Number: %d\n",start);
    printf("\tEnd Number: %d\n",stop);
    printf("\tSeparator: %c\n",sep);
    printf("--------------------------------------------------------------------------\n");
        for(gen=start;gen<=stop;gen++) {
        printf("%d%c",gen,sep);
        }
    printf("\n--------------------------------------------------------------------------\n");
    }
}