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From: owl <owl@rooftop.invalid>
Newsgroups: comp.os.linux.advocacy
Subject: Re: The substantiation that -highhorse asked for
Date: Wed, 29 Aug 2018 06:14:07 +0000 (UTC)
Organization: O.W.L.
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Xref: csiph.com comp.os.linux.advocacy:465361

DFS <nospam@nospam.com> wrote:
> 
> import random
> 
> print "Group 1: r<0"
> print "Group 2: r==0"
> print "Group 3: r>0 && r<=10"
> print "Group 4: r>10 && r<=100"
> print "Group 5: r>100 && r<=1000"
> print "Group 6: r>1000 && r<=10000"
> print "Group 7: r>10000 && r<=100000"
> print "Group 8: r>100000 && r<=1000000"
> print "Group 9: r>1000000"
> 
> def printgroup(grp):
>        print "Found random number " + str(r) + " in Group " + str(grp)
> 
> for j in range(20):
>        r = random.randint(-1000,1001)
>        if r < 0:               printgroup(1); exit
>        if r > 1000000: printgroup(9); exit
>        comps = 
> [(-1,0),(1,10),(11,100),(101,1000),(1001,10000),(10001,100000),(100001,1000000)]
>        for i, x in enumerate(range(len(comps))):
>                if r > comps[i][0] and r <= comps[i][1]: printgroup(i+2); exit
>                i+=1    
> 
> 
> 
> That's 3 if-then-exits to handle 9 comparisons

If you call that 3 ifs, then I get to call this zero ifs:

anon@lowtide:~/code/ifs$ cat goo.c
#include <stdio.h>
#include <stdlib.h>

void flz(void){printf("a<0\n");}
void fgm(void){printf("a>1000000\n");}
void f0(void){printf("a==0\n");}
void f1(void){printf("a>0 && a<=10\n");}
void f2(void){printf("a>10 && a<=100\n");}
void f3(void){printf("a>100 && a<=1000\n");}
void f4(void){printf("a>1000 && a<=10000\n");}
void f5(void){printf("a>10000 && a<=100000\n");}
void f6(void){printf("a>100000 && a<=1000000\n");}

int main(int argc, char *argv[])
{
   int a=0;
   int i=0;
   void (*fp[1000001])(void)={0};
   fp[0]=f0;
   for(i=1;i<=10;i++) fp[i]=f1; 
   for(i=11;i<=100;i++) fp[i]=f2;
   for(i=101;i<=1000;i++) fp[i]=f3;
   for(i=1001;i<=10000;i++) fp[i]=f4;
   for(i=10001;i<=100000;i++) fp[i]=f5;
   for(i=100001;i<=1000000;i++) fp[i]=f6;
   a=atoi(argv[1]);
   (a<0?flz:a>1000000?fgm:fp[a])();  
   return 0;
}
anon@lowtide:~/code/ifs$