What does it do?

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Witness
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What does it do?

Post by Witness » Tue Aug 25, 2015 3:28 am

Found this small program in a book:

Code: Select all

int a=10000,b,c=8400,d,e,f[8401],g;main(){for(;b-c;)f[b++]=a/5;for(;d=0,g=c*2;c-=14,printf("%.4d",e+d/a),e=d%a)for(b=c;d+=f[b]*a,f[b]=d%--g,d/=g--,--b;d*=b);}
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Doctor X
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Re: What does it do?

Post by Doctor X » Tue Aug 25, 2015 7:39 am

Simple:
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Rob Lister
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Re: What does it do?

Post by Rob Lister » Tue Aug 25, 2015 9:45 am

Witness wrote:Found this small program in a book:

Code: Select all

int a=10000,b,c=8400,d,e,f[8401],g;main(){for(;b-c;)f[b++]=a/5;for(;d=0,g=c*2;c-=14,printf("%.4d",e+d/a),e=d%a)for(b=c;d+=f[b]*a,f[b]=d%--g,d/=g--,--b;d*=b);}
Spoiler:
Pi, sloppily.

Code: Select all

main(){
        int a=10000,b,c=8400,d,e,f[8401],g;
        for(;b-c;)f[b++]=a/5;
        for(;d=0,g=c*2;c-=14,printf("%.4d",e+d/a),e=d%a)
            for(b=c;d+=f[b]*a,f[b]=d%--g,d/=g--,--b;d*=b);
      }
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DrMatt
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Re: What does it do?

Post by DrMatt » Tue Aug 25, 2015 3:33 pm

Obscure code is no longer impressive.
We've all heard the story of Mel.
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Witness
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Re: What does it do?

Post by Witness » Wed Aug 26, 2015 11:48 pm

Well done Rob, you nailed it.

@ Matt: read the Mel story with pleasure, reminded me of a time when bits were set with switches. But I think the programmer diden't want to obfuscate (which I used, of course), just to show that lots of π's decimals could be generated with a handful of bytes.
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