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Oct 15th, 2006

Weird Stuff about Dev-C++ Compiler

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I use Bloodshed Dev-C++ version 4.9.9.2 and it is a little weird in that it accepts "and" as "&&" and "or" as "||", not to mention not requiring parentheses around separate clauses in and/or connected statements. Therefore it would read the following as the same.

if(voice==loud or voice==annoying and voice==whiny){
cout<<"SHUT UP!"<<endl;
}

if((voice==loud) || ((voice==annoying) && (voice==whiny))){
cout<<"SHUT UP!"<<endl;
}

Strange, huh?
Venomlash

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Oct 15th, 2006

Re: Weird Stuff about Dev-C++ Compiler

It's not an "abnormality," it's actually part of the C++ standard. As I understand it, operators like 'and' and 'or' are included for users with different character sets. See: http://david.tribble.com/text/cdiffs.htm#C99-alt-tok

Microsoft compilers appear to implement these as macros instead of keywords in the ciso646 header.

As for the second part of your post, the equality operator takes precedence over logical AND, which takes precendence over logical OR, so the parentheses aren't required in either case.

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Oct 16th, 2006

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Re: Weird Stuff about Dev-C++ Compiler

Best stick with && instead of "and" as you'll encounter problems if you switch compilers.

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Oct 16th, 2006

Re: Weird Stuff about Dev-C++ Compiler

Click to Expand / Collapse Quote originally posted by iamthwee ...

Best stick with && instead of "and" as you'll encounter problems if you switch compilers.

Again, it depends on which country you live in. Not all keyboards have a & key!!!! Actually "and" looks a lot more readable than "&&". Dev-C++ uses a much more international open source GNU compiler. Thank you GloriousEremite for the reference site!

Last edited by vegaseat; Oct 16th, 2006 at 3:04 pm.

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Oct 16th, 2006

Re: Weird Stuff about Dev-C++ Compiler

I think he does have the & key. So therefore he should use it -if he wants to guarantee better portability.

If not I would expect him to have a little note saying, if you intend to use this code with such and such a compiler please include the relevant header.

>Not all keyboards have a & key!!!!
Can't ya just hold down [alt] + ### or whatever the number is for an ampersand?

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Oct 16th, 2006

Re: Weird Stuff about Dev-C++ Compiler

Click to Expand / Collapse Quote originally posted by vegaseat ...

Again, it depends on which country you live in. Not all keyboards have a & key!!!! Actually "and" looks a lot more readable than "&&". Dev-C++ uses a much more international open source GNU compiler.

As expected from a Python proponent

But seriously, i agree with Mr. Iamthwee, its would be better NOT to use such keywords which are fully integrated in C++ standards but require the inclusion of a seperate header file #include <iso646.h>. So if you want your C++ code to be compatible with C standards, better stick to the && operator.

Quote ...

C90 does not have these built-in keywords, but it does provide a standard header file that contains definitions for the same words as macros, behaving almost like built-in keywords. The recommended practice for code intended to be compiled as both C and C++ is to use "and" identifiers only for special meanings, and only after including the header <iso646.h> .

Last edited by ~s.o.s~; Oct 16th, 2006 at 3:23 pm.

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Oct 16th, 2006

Re: Weird Stuff about Dev-C++ Compiler

ios646.h is apparently available in the C99 C standards. But I don't know how many compilers have implement those new C standards yet.

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Oct 16th, 2006

Re: Weird Stuff about Dev-C++ Compiler

Click to Expand / Collapse Quote originally posted by Ancient Dragon ...

ios646.h is apparently available in the C99 C standards. But I don't know how many compilers have implement those new C standards yet.

I use Code::Blocks IDE which comes packed with the GCC Mingw compiler and the C File created in it does not recognize the C++ keywords.

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Oct 16th, 2006

Re: Weird Stuff about Dev-C++ Compiler

I use turbo c which crashes most of the time.

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Oct 16th, 2006

Re: Weird Stuff about Dev-C++ Compiler

The C compiler that comes with Dev-CPP must be more modern ...

C++ Syntax (Toggle Plain Text)
// using "and" and "or" rather than "&&" and "||"
// as a Dev-Cpp  C project
 
#include <stdio.h>
#include <iso646.h>  // yes this is needed!
 
int main()
{
  int loud, annoying, whiny;
  int voice = 1;
 
  loud = annoying = whiny = 1;
 
  if (voice==loud or voice==annoying and voice==whiny)
  {
    printf("SHUT UP!\n");
    //cout<<"SHUT UP!"<<endl;
  }
  getchar();  
  return 0;
}
// using "and" and "or" rather than "&&" and "||"
// as a Dev-Cpp  C project

#include <stdio.h>
#include <iso646.h>  // yes this is needed!

int main()
{
  int loud, annoying, whiny;
  int voice = 1;
  
  loud = annoying = whiny = 1;
  
  if (voice==loud or voice==annoying and voice==whiny)
  {
    printf("SHUT UP!\n");
    //cout<<"SHUT UP!"<<endl;
  }
  getchar();  
  return 0;
}

Turbo C??? I thought that was pretty bad 20 years ago!

Last edited by vegaseat; Oct 16th, 2006 at 4:30 pm.

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