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