An old scripted calculator I wrote several years ago. Fairly complex and admittedly not directly useful at all, but it does contain some fairly infrequently used functions most people that use trigedit may not be familiar with (extract, strlen, charat, etc.).
Code:
Name: 'Calculator',  VNum: [57742], RNum: [ 4235]
Trigger Intended Assignment: Rooms
Trigger Type: Command , Numeric Arg: 7, Arg list: *
Commands:
if %cmd% == math
  if %arg.cdr%
    extract number1 1 %arg%
    extract operation 2 %arg%
    extract number2 3 %arg%
    if %operation% == ^
      set lengthofnum2 %number2.strlen%
      set lastnum %number2.charat(%lengthofnum2%)%
      if %number2% > 10 && %number2% < 20
        set suffix th
      else
        switch %lastnum%
          case 1
            set suffix st
          break
          case 2
            set suffix nd
          break
          case 3
            set suffix rd
          break
          default
            set suffix th
          break
        done
      end    
      set formula %number1% raised to the %number2%%suffix% power
      if %number2% == 1
        set outcome %number1%
      elseif %number2% == 0
        set outcome 1
      else
        eval i %number2%
        if %i% > 101
          %echo% That would loop more than 100 times, aborting.
          halt
        end
        eval temp_answer %number1%
        while %i% > 1
          eval temp_answer2 %temp_answer% * %number1%
          eval temp_answer %temp_answer2%
          set outcome %temp_answer%
          eval i %i% - 1
        done
      end
      %echo% The answer to %formula% is: %outcome%.
    elseif %operation% == +
      eval ans 4 %operation% 2
      if %ans% == 6        
        eval sum %number1% + %number2%
        %echo% The sum of %arg% is %sum%.
      elseif %ans% == 2
        eval difference %number1% - %number2%
        %echo% The difference of %arg% is %difference%.
      end
    elseif %operation% == divided_by
      eval quotient %number1% / %number2%
      if %number1% > %quotient% * %number2%
        eval remdiff %quotient% * %number2%
        eval rem %number1% - %remdiff%
        %echo% The quotient of %arg% is %quotient% %rem%/%number2%.
      else
        %echo% The quotient of %arg% is %quotient%
      end
    elseif %operation% == x
      eval product %number1% * %number2%
      %echo% The product of %arg% is %product%
    else
      %echo% For this to work you must type math followed by 2 integers seperated by an operation.
      %echo% For example: math 5 \^ 4 OR math 4 + 2
    end
  else
    %echo% For this to work you must type math followed by 2 integers seperated by an operation.
    %echo% For example: math 5 \^ 4 OR math 4 + 2
  end
else
  return 0
end