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NNTP-Posting-Date: Fri, 06 May 2011 08:54:21 -0500
Date: Fri, 06 May 2011 06:54:09 -0700
From: Patricia Shanahan <pats@acm.org>
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Subject: Re: boolean to int : was char to decimal
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On 5/6/2011 6:00 AM, Jeff Higgins wrote:
> On 05/05/2011 04:03 AM, Lawrence D'Oliveiro wrote:
>> In message<Xns9EDBB8224D5B6vaj4088ianshef@138.125.254.103>, Ian Shef
>> wrote:
>>
>> Funny, they could do all this for char, but not for boolean.
>
> Recently I was translating a piece of C++ code to Java.
> I'm wondering how others might make this translation.
> Thanks, JSH.
>
> double d2;
> double d3;
> double e;
>
> C++ test:
> int test = (int(d2 > e) << 1) + int(d3 > e);
>
> Java test:
> int t = d2 > e ? 1<<1 : 0;
> int test = d3 > e ? t+1 : t;
>
> switch(test)
> { case(0):
> case(1):
> case(2):
> case(3):
> }
>
>

if(d2 > e) {
   if(d3 > e) {
      // case 3 code
   } else {
      // case 2 code
   }
} else {
   if(d3 > e) {
      // case 1 code
   } else {
      // case 0 code
   }
}

I have not tested this, so there may be errors, but I hope the concept
is clear. If there is flow-through between the cases I would first
extract each piece of common code into a method.

Patricia