coldfusionJedi

This entry was posted on Friday, May 5, 2006 at 10:34 AM. It was filed in the following categories: ColdFusion. It has been viewed 2,035 times and has 12 comments.

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• Comment 1 written by Teddy Payne on 5 May 2006, at 12:07 PM

  

  It did take me more than 5 minutes. It took me 15. I wanted to do the extra credit.
  
  <cffunction name="strEnglishToMath" returntype="numeric" output="true" hint="I return the math evlaution of an english expresss.">
     <cfargument name="strExp" type="string" required="true">
  
     <cfset numResult = 0>
  
     <cfscript>
        strExp = ReReplace(strExp,"zero","0","ALL");
        strExp = ReReplace(strExp,"one","1","ALL");
        strExp = ReReplace(strExp,"two","2","ALL");
        strExp = ReReplace(strExp,"three","3","ALL");
        strExp = ReReplace(strExp,"four","4","ALL");
        strExp = ReReplace(strExp,"five","5","ALL");
        strExp = ReReplace(strExp,"six","6","ALL");
        strExp = ReReplace(strExp,"seven","7","ALL");         
        strExp = ReReplace(strExp,"eight","8","ALL");   
        strExp = ReReplace(strExp,"nine","9","ALL");   
        strExp = ReReplace(strExp,"ten","10","ALL");
  
        strExp = ReReplace(strExp,"plus","+","ALL");
        strExp = ReReplace(strExp,"minus","-","ALL");
        strExp = ReReplace(strExp,"multiply","*","ALL");
        strExp = ReReplace(strExp,"divide","/","ALL");
        
        reScript = "[0-9]+[ ]+[\+\-\/\*]+[ ]+[0-9]+";
        strPos = REFind(reScript, strExp,1,"True");
         strExp = mid(strExp, strPos.pos[1], strPos.len[1]);
  
        leftNumber = Trim(listgetat(strExp,1,"+-/*"));
        rightNumber = Trim(listgetat(strExp,2,"+-/*"));
        
        reScript = "[\+\-\/\*]";
        strPos = REFind(reScript, strExp,1,"True");
         operator = mid(strExp, strPos.pos[1], strPos.len[1]);
     
        if(not (rightNumber eq 0 and operator eq "/"))
        {
           switch(operator)
           {
              case "+":
              {
                 numResult = leftNumber + rightNumber;
                 break;
              }         
              case "-":
              {
              numResult = leftNumber - rightNumber;
              break;
              }
              case "/":
              {
              numResult = leftNumber / rightNumber;
              break;
              }
              case "*":
              {
              numResult = leftNumber * rightNumber;
              break;                           
              }
           }
        }
  
     </cfscript>
  
     <cfreturn numResult>
  
  </cffunction>
  
  <cfset strExp = "five divide zero is?">
  
  <cfoutput>
  #strEnglishToMath(strExp)#
  </cfoutput>

• Comment 2 written by Kyle Hayes on 5 May 2006, at 12:18 PM

  

  <cfscript>
  function NaturalToNum(str) {
     switch (str) {
        case "one":
           returnVal = 1;
           break;
        case "two":
           returnVal = 2;
           break;
        case "three":
           returnVal = 3;
           break;
        case "four":
           returnVal = 4;
           break;
        case "five":
           returnVal = 5;
           break;
        case "six":
           returnVal = 6;
           break;
        case "seven":
           returnVal = 7;
           break;
        case "eight":
           returnVal = 8;
           break;
        case "nine":
           returnVal = 9;
           break;
        case "ten":
           returnVal = 10;
           break;
        default:
           returnVal = str;
           break;
     }
     return returnVal;
  }
  
  function NaturalToSign(str) {
     switch (str) {
        case "plus":
           returnVal = "+";
           break;
        case "times":
           returnVal = "*";
           break;
        case "minus":
           returnVal = "-";
           break;
        case "divided":
           returnVal = "/";
           break;
        default:
           returnVal = str;
           break;
     }
     return returnVal;
  }
  
  function EvalNaturalEquation(str) {
     strArr = ListToArray(str," ");
     for(i = 1; i lte ArrayLen(strArr); i = i + 1) {
        if(NaturalToNum(NaturalToSign(strArr[i])) eq strArr[i]) {
           ArrayDeleteAt(strArr,i);
        }
        else {
           strArr[i] = NaturalToNum(NaturalToSign(strArr[i]));
        }
     }
     strList = ArrayToList(strArr, " ");
     return Evaluate(strList);
  }
  </cfscript>
  <cfif isDefined('form.equation') and len(trim(form.equation))>
     <cfset answer = EvalNaturalEquation(form.equation)>
  </cfif>

• Comment 3 written by Kyle Hayes on 5 May 2006, at 12:19 PM

  

  Here is a demo:
  http://www.kylehayes.info/quizzes/naturalCalc.cfm

• Comment 4 written by Kyle Hayes on 5 May 2006, at 12:19 PM

  

  Mine will allow more than two numbers and one sign as argument, type it out just like a regular equation.

• Comment 5 written by Kyle Hayes on 5 May 2006, at 12:23 PM

  

  Made the following corrections to the return of EvalNaturalEquation:
  try {
        returnVal = Evaluate(strList);
     }
     catch(any e){
        returnVal = "Cannot divide by 0";
     }
     return returnVal;

• Comment 6 written by Tuyen on 5 May 2006, at 12:44 PM

  

  Kyle,
  
  Tried your demo: Entered "onex plus twoy", got the wrong error message: "Cannot divide by 0"...
  
  Happy Friday!

• Comment 7 written by David on 5 May 2006, at 1:39 PM

  

  hmmm i was thinking of making this check for more than one math statement...
  
  Couldn't find any replacement for using Evaluate(), took too long trying to come up with one...
  
  <!--- change this parameter to test --->
  
  <cfparam name="form.mathstring" default="fivex times one" />
  
  
  <cfscript>
  
  //set invalid variables to 0 : used to check for division against zero invalid =1 means dividing by zero : invalid 3 means invalid characters
  variables.invalid = 0;
  variables.number1=0;
  variables.number2=0;
  
  //set 2D array to put in number calculation **** 1-1 = operator 1-2 = first number 1-3 = second number
  variables.mathOperators = ArrayNew(2);
  
  //set array for string operators
  variables.MathOperatorsArray = ArrayNew(1);
  
  //set array for symbol operators
  variables.MathSymbolArray = ArrayNew(1);
  
  //set array for string number = Array number
  variables.NumberArray = Arraynew(1);
  
  
  variables.mathOperatorsArray[1] = 'plus';
  variables.mathOperatorsArray[2] = 'minus';
  variables.mathOperatorsArray[3] = 'multiply';
  variables.mathOperatorsArray[4]= 'divide';
  variables.mathOperatorsArray[5]='times';
  
  variables.mathSymbolArray[1] = '+';
  variables.mathSymbolArray[2] = '-';
  variables.mathSymbolArray[3] = '*';
  variables.mathSymbolArray[4] = '/';
  variables.mathSymbolArray[5] = '*';
  
  variables.numberArray[1] = 'one';
  variables.numberArray[2] = 'two';
  variables.numberArray[3] = 'three';
  variables.numberArray[4] = 'four';
  variables.numberArray[5] = 'five';
  variables.numberArray[6] = 'six';
  variables.numberArray[7] = 'seven';
  variables.numberArray[8] = 'eight';
  variables.numberArray[9] = 'nine';
  variables.numberArray[10] = 'ten';
  variables.numberArray[11] = 'zero';
  
  //check loop for operators
  for(i=1;i lte ArrayLen(variables.MathOperatorsArray); i=i+1)
     {
  
        //check to see which operator to use
     if (form.mathstring contains variables.MathOperatorsArray[i])
     
           {
              // set math operator into array
              variables.mathOperators[i][1]=variables.mathSymbolArray[i];
  
              //get first number
              variables.firstnumber = Gettoken(form.mathstring,1,' ');
              
              //get second number
              variables.secondnumber = GetToken(form.mathstring,3,' ');
              
              
  
              //find numerical value of strings
              for (num1 = 1;num1 lte ArrayLen(variables.numberArray); num1 = num1 + 1)
                 {
              
                 if(comparenocase(variables.numberArray[num1],variables.firstnumber) eq 0) variables.number1 =num1;
                 
                 if(comparenocase(variables.numberArray[num1],variables.secondnumber) eq 0)variables.number2 =num1;
                 }
  
              
              //set numbers into array
              variables.mathOperators[i][2] = variables.number1;
              variables.mathOperators[i][3] = variables.number2;
     
              //check for invalid characters
              if(variables.number1 eq 0 or variables.number2 eq 0)variables.invalid = 3;
              
              // check for zero divisability ********************
              if(variables.secondnumber eq 11) variables.invalid = 1;
              
           
              
           }
           
     }
     
  
  
  
  
  //check to see if we should show division by zero
  if(variables.invalid eq 0){
  
     //Do math and check for divisible by 0
     //loop through mathoperators array to find what to calculate
     
     for(math=1; math lte ArrayLen(variables.mathoperators); math = math +1)
        {
           
           if(not ArrayIsEmpty(variables.mathoperators[math]))
           
               variables.calcoutput = 'Your answer is: ' & Evaluate('#variables.mathoperators[math][2]# #variables.mathoperators[math][1]# #variables.mathoperators[math][3]#');
           }
           
  }
  
  // say something to tell them that their total was division by 0
  else
  {
  if (variables.invalid eq 1)
  variables.calcoutput = 'You know better than to Divide by zero punk!'; else variables.calcoutput = 'Invalid math string! Cannot process the form query.';
  }
        
  writeoutput(variables.calcoutput);
  </cfscript>
  
  <CFDUMP var="#variables.mathoperators#" />

• Comment 8 written by Daniel Daugherty on 5 May 2006, at 1:53 PM

  

  I have not written the code yet (my work dev server does not have internet access). But should be able to do this with a call to google search api. As it contains a calculator and does full text calc also.
  
  http://www.google.com/help/features.html#calculato...
  
  I am a big fan of using existing code when possible.

• Comment 9 written by Raymond Camden on 5 May 2006, at 1:59 PM

  

  Good one Daniel.

• Comment 10 written by Chris Mallinson on 5 May 2006, at 2:03 PM

  

  Here's my attempt. The time limit prevented me from commenting this :-)
  
  I'm pretty sure it works...
  
  
  <cfif isdefined("form.submit")>
     <cfscript>
     mathString = form.question;
  
     mathString = rereplacenocase(mathString,'(divided by)|(by)|(over)|(into)','/','all');
     mathString = rereplacenocase(mathString,'(plus)|(added to)|(and)|(to)','+','all');   
     mathString = rereplacenocase(mathString,'(minus)|(less)|(subtract)','-','all');
     mathString = rereplacenocase(mathString,'(from\s)','- -','all');   
     mathString = rereplacenocase(mathString,'(multiplied by)|(times)','*','all');
     mathString = rereplacenocase(trim(mathString),'^multiply\s([a-z0-9]*)\s\+','\1 *');
     mathString = rereplacenocase(trim(mathString),'^((add)|(subtract)|(divide)|(multiply))','');
     numberStrings = 'zero,one,two,three,four,five,six,seven,eight,nine,ten';
     numberDigits = '0,1,2,3,4,5,6,7,8,9,10';
     mathString = trim(replacelist(mathString,numberStrings,numberDigits));
     if (refind('/ 0$',mathString))
        answer = 'undefined';
     else
        answer = evaluate(mathString);   
     writeOutput(answer);
     </cfscript>
  
  </cfif>
  
  <cfform name="math" action="#CGI.SCRIPT_NAME#" method="post" preservedata="yes">
  <cfinput name="question" type="text" size="30">
  <input type="submit" name="submit" value="do the math" />
  </cfform>

• Comment 11 written by Kyle Hayes on 5 May 2006, at 2:24 PM

  

  Now this is interesting, when you type the english equation into google it actually gives you an english answer. Observe:
  http://www.google.com/search?q=five+plus+two&b...

• Comment 12 written by Kyle Hayes on 5 May 2006, at 2:25 PM

  

  And it automagically assumes parenthesis where needed:
  http://www.google.com/search?hl=en&sa=X&oi...

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