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- parses $result
- sends $units along

# file name (temp): default_homework 
# used by lonxml::xmlparse() as input variable $safeinit to Apache::run::run()
# 
#
$RANDOMINIT=0;

sub caparesponse_check {
  my $answer='';
  my $type='';
  my $tol_type='';
  my $tolerance='';
  my $sig_lbound='';
  my $sig_ubound='';
  my $ans_fmt='';
  my $units='';
  my $calc='';
  my ($response,$expr)=@_;
  
  ($answer,$type,$tol_type,$tolerance,$sig_lbound,$sig_ubound,$ans_fmt,
   $units,$calc) = eval $expr.'return $answer,$type,$tol_type,$tolerance,$sig_lbound,$sig_ubound,$ans_fmt,$units,$calc';

  #type's definitons come from capaParser.h
  if ($type eq '' ) {
    if ( $answer eq ($answer *1.0)) { $type = 2;
    } else { $type = 3; }
  } else {
         if ($type eq 'cs')    { $type = 4;
    } elsif ($type eq 'ci')    { $type = 3;
    } elsif ($type eq 'mc')    { $type = 5;
    } elsif ($type eq 'fml')   { $type = 8;
    } elsif ($type eq 'subj')  { $type = 7;
    } else { return "ERROR: Unknown type of answer: $type" }
  }

  
  my $result = &caparesponse_capa_check_answer($response,$answer,$type,
					       $tol_type,$tolerance,
					       $sig_lbound,$sig_ubound,
					       $ans_fmt, $units,$calc);

  if    ($result == '1') { $result='EXACT_ANS'; } 
  elsif ($result == '2') { $result='APPROX_ANS'; }
  elsif ($result == '3') { $result='SIG_FAIL'; }
  elsif ($result == '4') { $result='UNIT_FAIL'; }
  elsif ($result == '5') { $result='NO_UNIT'; }
  elsif ($result == '6') { $result='UNIT_OK'; }
  elsif ($result == '7') { $result='INCORRECT'; }
  elsif ($result == '8') { $result='UNIT_NOTNEEDED'; }
  elsif ($result == '9') { $result='ANS_CNT_NOT_MATCH'; }
  elsif ($result =='10') { $result='SUB_RECORDED'; }
  elsif ($result =='11') { $result='BAD_FORMULA'; }
  elsif ($result =='12') { $result='WANTED_NUMERIC'; }
  else  {$result = "ERROR: Unknown Result: $result";}

  return ":$result:$response:$answer:";
}

sub tex {
  if ( $external::target eq "tex" ) {
    #$SCRIPT_RESULT.=@_[0];
    return @_[0];
  } else {
    #$SCRIPT_RESULT.=@_[1];
    return @_[1];
  }
}

sub web {
  if ( $external::target eq "tex" ) {
    #$SCRIPT_RESULT.=@_[1];
    return @_[1];
  } else {
    if ( $external::target eq "web") {
      #$SCRIPT_RESULT.=@_[0];
      return @_[0];
    } else {
      #$SCRIPT_RESULT.=@_[2];
      return @_[2];
    }
  }
}

sub problem {
  $SCRIPT_RESULT.='1';
  return '';
}

sub hinton {
  return 0;
}

sub random {
  my ($start,$end,$step)=@_;
  if ( ! $RANDOMINIT ) { srand($external::randomseed); $RANDOMINIT=1; }
  my $num=1+int(($end-$start)/$step);
  my $result=$start + int(rand() * $num)*$step;
  return $result;
}

sub tan  { sin($_[0]) / cos($_[0]) }
sub acos { atan2(sqrt(1 - $_[0] * $_[0]), $_[0] ); }
sub asin { atan2($_[0], sqrt(1- $_[0] * $_[0]) );  }

sub html {
  if ( $external::target eq "web" ) {
    #$SCRIPT_RESULT.=@_[0];
    return @_[0];
  }
}


sub pow   {return $_[0] ** $_[1]; }
sub ceil  {return (($_[0]-int($_[0]))== 0.0) ? $_[0] : (int($_[0])+ 1); }
sub floor {return int($_[0]);  }

sub format {
  my ($value,$fmt)=@_;
  $SCRIPT_RESULT.=sprintf('%.'.$fmt,$value);
}

sub map {
  my $num = $#_/2;
  my $i;
  my @used;
  my @permutation;
  for ($i=0; $i < $num;) {
    $rand = &random(1,$num,1);
    if ( $used[$rand] == '0' ) {
      $i++;
      $used[$rand]='1';
      $permutation[$i]=$rand;
    }
  }
  for ( $i=1 ; $i<$num+1 ; $i++ ) {
    ${$_[$permutation[$i]]}=$_[$i+$num]
  }
}

sub choose {
  my $num = $_[0];
  return $_[$num];
}
#$external::randomseed=time;
#$a=2;
#$b=2;
#$c=2;
#&map(1,\$a,\$b,\$c,3,4,5);
#print $a."\n".$b."\n";