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Diff for /loncom/homework/default_homework.lcpm between versions 1.19 and 1.20

version 1.19, 2001/05/08 14:57:12 version 1.20, 2001/05/25 21:20:19
Line 3 Line 3
 #   # 
 #  #
 #init some globals  #init some globals
   #use Math::Trig;
   #
   # Guy Albertelli
   #
   # 05/25/2001 H. K. Ng
   #
 $RANDOMINIT=0;  $RANDOMINIT=0;
 $pi=atan2(1,1)*4;  $pi=atan2(1,1)*4;
   
Line 149  sub atan { atan2($_[0], 1); } Line 155  sub atan { atan2($_[0], 1); }
 sub acos { atan2(sqrt(1 - $_[0] * $_[0]), $_[0] ); }  sub acos { atan2(sqrt(1 - $_[0] * $_[0]), $_[0] ); }
 sub asin { atan2($_[0], sqrt(1- $_[0] * $_[0]) );  }  sub asin { atan2($_[0], sqrt(1- $_[0] * $_[0]) );  }
 sub log10 { log($_[0])/log(10); }  sub log10 { log($_[0])/log(10); }
   sub factorial {
       my $input = int(shift);
       return "Error - unable to take factorial of an negative number ($input)" if $input < 0;
       return "Error - factorial result is greater than system limit ($input)" if $input > 170;
       return 1 if $input == 0;
       my $result = 1; 
       for (my $i=2; $i<=$input; $i++) { $result *= $i }
       return $result;
   }
   
   sub sgn {
       return -1 if $_[0] < 0;
       return 0 if $_[0] == 0;
       return 1 if $_[0] > 0;
   }
   
   sub min {
       my @sorted = sort { $a <=> $b || $a cmp $b } @_;
       return shift @sorted;
   }
   
   sub max {
       my @sorted = sort { $a <=> $b || $a cmp $b } @_;
       return pop @sorted;
   }
   
 sub html {  sub html {
   if ( $external::target eq "web" ) {    if ( $external::target eq "web" ) {
Line 156  sub html { Line 187  sub html {
   }    }
 }  }
   
   sub roundto {
       my ($input,$n) = @_;
       return sprintf('%.'.$n.'f',$input);
   }
   
   sub to_string {
       my ($input,$n) = @_;
       return sprintf('%'.$n,$input) if $n ne "";
       return sprintf($input) if $n eq "";
   }
   
   sub sub_string {
       my ($str,$start,$len) = @_;
       return substr($str,$start-1,$len);
   }
   
 sub pow   {return $_[0] ** $_[1]; }  sub pow   {return $_[0] ** $_[1]; }
 sub ceil  {return (($_[0]-int($_[0]))== 0.0) ? $_[0] : (int($_[0])+ 1); }  sub ceil  {return (($_[0]-int($_[0]))== 0.0) ? $_[0] : (int($_[0])+ 1); }
Removed from v.1.19  
changed lines
  Added in v.1.20

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