Subversion Repositories wimsdev

!set methtit=Add a number to the two sides of an inequality
!set methenv=ZZ QQ RR
!set methparmtype=number,parm inequality
!set methhelp=This method transforms an inequality of the form \(a > b)\
 into an equivalent one \(a + n > b + n), where \(n) is a number.

!if $wims_read_parm iswordof form check
 !goto $wims_read_parm
!endif

!exit
:form
 Add the number
 !read deduc/methparm.phtml 1,15
 to the two sides of the inequality
 !read deduc/methparm.phtml 2

!exit
:check
 !distribute items $methparmobj2 into data,left,sign,right
 methexp=Add \(methparm1) to the two sides of \($left $sign $right)

 !read deduc/sub/simplify $left + ($methparm1)\
        $right + ($methparm1)
 !distribute lines $out into newleft,newright
 !if $newleft=$empty or $newright=$empty
  error=bad_data
  !exit
 !endif
 newsign=$sign
 newobject2=$newleft $newsign $newright
 oldobject=2
 
 contextlist=$ct_Always,\
        $ct_Onlywhen the number added is positive,\
        $ct_Onlywhen the inequality is strict,\
        $ct_Onlywhen the inequality is not strict

 !if $askresult>1
  !read deduc/sub/simplify $left - ($methparm1)\
        $right - ($methparm1)
  !distribute lines $out into badleft, badright
  badsign=!translate internal <> to >< in $newsign
 
  resultlist=$newobject2,\
        $newleft $newsign $badright,\
        $badleft $newsign $newright,\
        $newleft $badsign $newright,\
        $newleft $badsign $badright
 !endif

!exit