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Challenge: Function that prints a n big tree (beehaw.org)

submitted 2 years ago* (last edited 2 years ago) by [email protected] to c/code_golf

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Write a function that prints an n big tree, e.g. for n=5:

     * 
    * * 
   * * * 
  * * * * 
 * * * * * 
    | |

Here is what I came up with in C:

N,i;a(n){for(i=N=N?N:n+2;i--;printf(i?"* "+(N-n-1<i):--n?"\n":"\n%*s",N,"| |"));n&&a(n);}

// the invocation isn't part of the golf:
main(){a(5);}

PS: Code blocks currently wrap around when they are too long, I've already submitted a patch to make them scroll horizontally instead.

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[–] l4sgc 2 points 2 years ago* (last edited 2 years ago) (1 children)

My JavaScript solution - ~~82~~ 103 chars:

~~a=n=>{for(s='',i=1;i<=n;i++)s+=' '.repeat(n-i)+'* '.repeat(i)+'\n';console.log(s)}~~

a=n=>{for(s='',i=0;++i<=n;)s+=' '.repeat(n-i)+'* '.repeat(i)+'\n';console.log(s+' '.repeat(n-2)+'| |')}

I'm happy I was able to beat ChatGPT, it had the same strategy but used additional for loops instead of string.repeat(), so it was 113 chars. But I suspect further improvements might be possible with array.reduce or other prototype functions I'm forgetting about.

[–] [email protected] 3 points 2 years ago (1 children)

very cool, but you forgot the trunk

[–] l4sgc 4 points 2 years ago

Woops, can you tell my teachers were always on my case for misreading the assignment :P