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« Creating a Mandelbrot set with 264 bytes of C++ code. | pseudo kleinian »
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Author Topic:  Sierpinski triangle  (Read 756 times)

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Offline v

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  • Posts: 56
Sierpinski triangle
« on: September 05, 2017, 05:35:35 AM »
Testing out the code tags.  C program to draw a Sierpinski triangle of arbitrary order.

Code: [Select]
#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[]){
int x, y, i;
int s = (argc > 1) ? 1 << abs(atoi(argv[1])) : 32;
//int sgn = (argc > 1 && atoi(argv[1]) > 0) ? 1 : -1;

for(y = s; y >= 0; y--) {
for(i = 0; i <= y>>1; i++) printf(" ");
for(x = 0; x < s-y; x++) printf("%c", ((x & y) !=0 ) ? ' ' : '#');
printf("\n");
}

return 0;
}

example:
Code: [Select]
$ gcc tri.c -o tri
$ ./tri 5
                 
                #
                ##
               # #
               ####
              #   #
              ##  ##
             # # # #
             ########
            #       #
            ##      ##
           # #     # #
           ####    ####
          #   #   #   #
          ##  ##  ##  ##
         # # # # # # # #
         ################
        #               #
        ##              ##
       # #             # #
       ####            ####
      #   #           #   #
      ##  ##          ##  ##
     # # # #         # # # #
     ########        ########
    #       #       #       #
    ##      ##      ##      ##
   # #     # #     # #     # #
   ####    ####    ####    ####
  #   #   #   #   #   #   #   #
  ##  ##  ##  ##  ##  ##  ##  ##
 # # # # # # # # # # # # # # # #
 ################################


Linkback: https://fractalforums.org/programming/11/sierpinski-triangle/202/
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Offline claude

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  • Posts: 1784
    • mathr.co.uk
Re: Sierpinski triangle
« Reply #1 on: September 05, 2017, 04:31:12 PM »
Nice!

Here's a slight variant that looks better with non-square characters:

Code: [Select]
#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[]){
int x, y, i;
int s = (argc > 1) ? 1 << abs(atoi(argv[1])) : 32;
//int sgn = (argc > 1 && atoi(argv[1]) > 0) ? 1 : -1;

for(y = s-1; y >= 0; y--) {
for(i = 0; i < y; i++) printf(" ");
for(x = 0; x < s-y; x++) printf("%s", ((x & y) !=0 ) ? "  " : "##");
printf("\n");
}

return 0;
}
example:
Code: [Select]
$ ./tri 5
                               ##
                              ####
                             ##  ##
                            ########
                           ##      ##
                          ####    ####
                         ##  ##  ##  ##
                        ################
                       ##              ##
                      ####            ####
                     ##  ##          ##  ##
                    ########        ########
                   ##      ##      ##      ##
                  ####    ####    ####    ####
                 ##  ##  ##  ##  ##  ##  ##  ##
                ################################
               ##                              ##
              ####                            ####
             ##  ##                          ##  ##
            ########                        ########
           ##      ##                      ##      ##
          ####    ####                    ####    ####
         ##  ##  ##  ##                  ##  ##  ##  ##
        ################                ################
       ##              ##              ##              ##
      ####            ####            ####            ####
     ##  ##          ##  ##          ##  ##          ##  ##
    ########        ########        ########        ########
   ##      ##      ##      ##      ##      ##      ##      ##
  ####    ####    ####    ####    ####    ####    ####    ####
 ##  ##  ##  ##  ##  ##  ##  ##  ##  ##  ##  ##  ##  ##  ##  ##
################################################################
Though it seems there is a bug in the forum: the "Select" link by the displayed code tag doesn't seem to function.
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Offline Anon

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  • Posts: 354
Re: Sierpinski triangle
« Reply #2 on: September 05, 2017, 04:43:00 PM »
Quote from: claude on September 05, 2017, 04:31:12 PM
Though it seems there is a bug in the forum: the "Select" link by the displayed code tag doesn't seem to function.
Works for me :)
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Offline claude

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  • Posts: 1784
    • mathr.co.uk
Re: Sierpinski triangle
« Reply #3 on: September 05, 2017, 10:41:02 PM »
Quote from: Anon on September 05, 2017, 04:43:00 PM
Works for me :)

thanks, it works for me on another computer too - strange browser-specific glitch I guess.  sorry for the noise!
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« Creating a Mandelbrot set with 264 bytes of C++ code. | pseudo kleinian »

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