Solver SHOWS addition on the number line, positive and negative numbers

Source code of 'SHOWS addition on the number line, positive and negative numbers'

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==section input Show how *[input a=3] and *[input b=4] add on the number line. ==section solution perl if( $b >= 0 ) { print "$b is a positive number. When you add it, it shifts the number to the right by $b units."; } else { print "$b is a negative number. When you add it, it shifts the number to the left by $b units."; } $sum = $a + $b; my $minx = -10; $minx = $a if $a < $minx; $minx = $b if $b < $minx; $minx = $sum if $sum < $minx; my $maxx = 10; $maxx = $a if $a > $maxx; $maxx = $b if $b > $maxx; $maxx = $sum if $sum > $maxx; print " This s a cartoon:<BR> {{{ cartoon( number_line( 400, $minx, $maxx, $a ), number_line( 400, $minx, $maxx, $a, $a+$b ) ) }}}"; ==section output sum ==section check a=3 b=4 sum=7

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