version 1.155, 2006/12/15 21:10:13
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version 1.156, 2006/12/15 22:11:43
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Line 535 sub end_mathresponse {
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Line 535 sub end_mathresponse {
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return $result; |
return $result; |
} |
} |
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sub implicit_multiplication { |
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my ($expression)=@_; |
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# Escape scientific notation, so 3e8 does not become 3*e*8 |
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# 3e8 -> 3&8; 3e-8 -> 3&-8; 3E+8 -> e&+8 |
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$expression=~s/(\d+)e([\+\-]*\d+)/$1\&\($2\)/gsi; |
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# 3x10^8 -> 3&8; 3*10^-8 -> 3&-8 |
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$expression=~s/(\d+)(?:x|\*)10(?:\^|\*\*)([\+\-]*\d+)/$1\&\($2\)/gsi; |
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# Fill in multiplication signs |
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# a b -> a*b;3 b -> 3*b;3 4 -> 3*4 |
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$expression=~s/(\w)\s+(\w)/$1\*$2/gs; |
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# )( -> )*(; ) ( -> )*( |
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$expression=~s/\)\s*\(/\)\*\(/gs; |
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# 3a -> 3*a; 3( -> 3*(; 3 ( -> 3*(; 3A -> 3*A |
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$expression=~s/(\d)\s*([a-zA-Z\(])/$1\*$2/gs; |
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# a ( -> a*( |
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$expression=~s/(\w)\s+\(/$1\*\(/gs; |
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# )a -> )*a; )3 -> )*3; ) 3 -> )*3 |
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$expression=~s/\)\s*(\w)/\)\*$1/gs; |
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# 3&8 -> 3e8; 3&-4 -> 3e-4 |
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$expression=~s/(\d+)\&\(([\+\-]*\d+)\)/$1e$2/gs; |
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return $expression; |
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} |
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sub start_answer { |
sub start_answer { |
my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_; |
my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_; |