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From: fir <fir@grunge.pl>
Newsgroups: comp.lang.c
Subject: Re: else ladders practice
Date: Thu, 31 Oct 2024 15:29:34 +0100
Organization: i2pn2 (i2pn.org)
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References: <3deb64c5b0ee344acd9fbaea1002baf7302c1e8f@i2pn2.org> <slrnvi746p.fkp.dan@djph.net>
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To: Dan Purgert <dan@djph.net>
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Dan Purgert wrote:
> On 2024-10-31, fir wrote:
>> somethins i got such pices of code like
>>
>> if(n==1) {/*something/}
>> if(n==2) {/*something/}
>> if(n==3) {/*something/}
>> if(n==4) {/*something/}
>> if(n==5) {/*something/}
>>
>> technically i would need to add elses - but the question is if to do that
>>
>> do teh code has really chance to be slower without else (except some
>> very prmitive compilers) ??
>
> In the above, all conditionals are always checked -- that is the truth
> of a previous conditional statement has no bearing on subsequent tests.
> This leads to the potential of tests going off in directions you hadn't
> necessarily anticipated.
>
> However, 'if..elseif..else' will only check subsequent conditionals if
> the prior statements were false.  So for the case that "n=2", you're
> only ever testing the two cases "if (n==1)" (which is false) and
> "elseif(n==2)".  The computer just skips to the end of the set of
> statements.
>
>
> Given this MWE (my own terrible code aside ;) ):
>
>    int main(){
>      int n=0;
>      printf ("all if, n=%u\n",n);
>      if (n==0) { printf ("n: %u\n",n); n++;}
>      if (n==1) { printf ("n: %u\n",n); n++;}
>      if (n==2) { printf ("n: %u\n",n); n++;}
>      if (n==3) { printf ("n: %u\n",n); n++;}
>      if (n==4) { printf ("n: %u\n",n); n++;}
>      printf ("all if completed, n=%u\n",n);
>
>      n=3;
>      printf ("with else if, n=%u\n",n);
>      if (n==0) { printf ("n: %u\n",n); n++;}
>      else if (n==1) { printf ("n: %u\n",n); n++;}
>      else if (n==2) { printf ("n: %u\n",n); n++;}
>      else if (n==3) { printf ("n: %u\n",n); n++;}
>      else { printf ("n: %u\n",n); n++;}
>      printf ("with else if completed, n=%u\n",n);
>    }
>
>
> You'll get the output:
>
> all if, n=0
> n: 0
> n: 1
> n: 2
> n: 3
> n: 4
> all if completed, n=5
> with else if, n=3
> n: 3
> with else if completed, n=4
>
> HTH :)
>
i not modify n in those {} blocks so this example is not much relevant

my quiestion is more liek what is a metter of beter style

from my youth i roughly always added those elses notw i consider not to 
write them