Re: Fortran vs C++ vs. etc (has little to do with realtime anymore)

[Oleg Krivosheev <kriol@fnal.gov>]

Hi, Rick


rhawkins@iastate.edu (Rick Hawkins) writes:

> 
> 
> In article <vi8k9ge42bw.fsf@drabble.fnal.gov>,
> Oleg Krivosheev  <kriol@fnal.gov> wrote:
> 
> >rhawkins@iastate.edu (Rick Hawkins) writes:
> 
> >> yes!!!  learning c++ after not using c for ten years took some work.
> >> Fortran after 12 years didn't; I could sit back donw and code.
> 
> >well, if you're talking about F77, yes. FYI, there are already
> >F90 and F95 here. I doubt you can program in F95 without
> >learning - just as you did with C++.
> 
> I'm using F90; It was Fortran IV on a pr1me and almost-f77 on tops 20
> back then.

well, that's exactly what i was asking about - there were NO
F90/F95 twelve years ago ! If you're using F90 now, you learned
it somehow. Either i misunderstood something or our claim

"> >> Fortran after 12 years didn't; I could sit back donw and code."

is wrong.

> >cannot find max() in c++?
> 
> I tried.  I looked.  I'm convinced it must be there, but . . .
> 
> >couldn't figure how to write function with variable numbers
> >of arguments?
> 
> In the two books that I had, there was a single example, whihc managed
> not to explain. I  wasn't just the issue of variable number of
> arguments, but of arbitrarily large variable numbers 
> (i wanted my max()!  :)

sorry, i have only min ;)

well, try example below for min with
arbitrary larger number of arguments. Hope it can help

#include <assert.h>
#include <stdio.h>
#include <stdarg.h>

double
dmin( int nofargs, ... ) {

  double res = 1.0e+38, arg;
  int j;
  va_list ap;
  
  assert( nofargs > 1 );

  va_start(ap, nofargs );

  for( j = 0; j < nofargs; ++j ) {
    arg=va_arg( ap, double );
    if ( arg < res ) {
      res = arg;
    }
  }
  va_end(ap);
  return res;
}

int
main( void ) {

  printf( "%e\n", dmin( 2, 1.0, 2.0 ) );
  
  printf( "%e\n", dmin( 3, 0.0, 1.0, 2.0 ) );
  
  printf( "%e\n", dmin( 5, 0.0, 1.0, 2.0, 7.0, -0.2 ) );

  return 0;
}


> >there is something wrong with your C++ installation
> >or with your C/C++ book.
> 
> I assume it's the books; the compiler was either DEC cc or gcc; i forget
> now.

code above works fine with gcc on Sparc/Solaris 2.5 box

regards

OK