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HTML

              
                <div id='calculator'>
<!--   <div id='mode'>DEG</div> -->
  <div class='output' id='prev_entry'>
  </div>
  <div class='output' id='prev_eval'>
  </div>
  <div class='output' id='curr_entry'>
  </div>
  <div class='output' id='curr_eval'>
  </div>
<!--   <div class='output' id='entry'><input size='35'></input>
  </div> -->
  <div class='output' id='entry'>
  </div>
  <div class='row'>
    <button class='mode' id='deg'>DEG</button>
    <button id='rad'>RAD</button>  
    <button class='func trig' id='asin'>asin</button>
    <button class='func trig' id='acos'>acos</button>
    <button class='func trig' id='atan'>atan</button>
    <button class='func' id='fact'>!</button>
    <button class='func' id='ans'>Ans</button>
  </div>
  <div class='row'>
    <button class='lside func' id='pi'>&pi;</button>
    <button class='lside func' id='recip'>1/x</button>
    <button class='func trig' id='sin'>sin</button>    
    <button class='func trig' id='cos'>cos</button>
    <button class='func trig' id='tan'>tan</button>
    <button class='other' id='lpar'>(</button>
    <button class='other' id='rpar'>)</button>
  </div>
  <div class='row'>
    <button class='lside func' id='x_to_y'>x<sup>y</sup></button>
    <button class='lside func' id='nth_root'><sup>y</sup>&radic;<span style="text-decoration:overline">x</span>
</button>
</button>
    <button class='nums' id='7'>7</button>
    <button class='nums' id='8'>8</button>
    <button class='nums' id='9'>9</button>
    <button class='ops' id='divide'>&divide</button>
    <button class='other' id='neg'>(-)</button>
  </div>
  <div class='row'>
    <button class='lside func' id='xsq'>x<sup>2</sup></button>
    <button class='lside func' id='sqrt'>&radic;<span style="text-decoration:overline">x </span>
</button>
    <button class='nums' id='4'>4</button>
    <button class='nums' id='5'>5</button>
    <button class='nums' id='6'>6</button>
    <button class='ops' id='mult'>&times;</button>
    <button class='undo' id='clearall'>AC</button>
  </div>
  <div class='row'>
    <button class='lside func' id='e_to_x'>e<sup>x</sup></button>
    <button class='lside func' id='ln'>ln</button>
    <button class='nums' id='1'>1</button>
    <button class='nums' id='2'>2</button>
    <button class='nums' id='3'>3</button>
    <button class='ops' id='sub'>-</button>
    <button class='undo' id='clear'>C</button>
  </div>
  <div class='row'>
    <button class='lside func' id='ten_to_x'>10<sup>x</sup></button>
    <button class='lside func' id='log'>log</button>
    <button class='nums' id='0'>0</button>
    <button class='other' id='dec'>.</button>
    <button class='other' id='EE'>EE</button>
    <button class='ops' id='plus'>+</button>
    <button class='undo' id='back'>&larr;</button>
  </div>
  <div class='row'>
    <button id='equals'>=</button>
  </div>
</div>

<ul id='upcoming'><strong>Upcoming Features:</strong>
  <li>Get the nth root button working</li>
  <li>Allow keyboard entry</li>
  <ul><li>Move cursor to allow inline editing of input</li></ul>
  <li>Add "entry" button to display the previous entry and allow editing (maybe)</li>
  <li>Store more entries in history (maybe)</li>
  <li>Clean up the javascript code</li>
</ul>
              
            
!

CSS

              
                body {
  margin-top: 20px;
  background: url('http://parade.com/wp-content/uploads/2013/05/maths-ftr.jpg') fixed;
  background-size: cover;
}

#calculator {
  background-color: #D3D3D3;
  width: 360px;
  height: 530px;
/*   width: 490px; */
/*   height: 730px; */
  border: 1px solid black;
  margin: auto;
  border-radius: 5px;
  padding-top: 20px;
}

.mode {
  background-color: green;
  color: white;
}

#prev_entry, #entry {
  background-color: white;
  width: 95%;
  height: 30px;
  text-align: left;
  margin: auto;
  font-size: 20px;
}

#entry {
  margin-bottom: 10px;
}

input {
  width: 100%;
}

#prev_eval {
  background-color: white;
  width: 95%;
  height: 30px;
  text-align: right;
  margin: auto;
  font-size: 20px;
  border-bottom: 0.5px black solid;  
}

#curr_entry {
  background-color: #F0F0F0;
  width: 95%;
  height: 30px;
  text-align: left;
  margin: auto; 
  font-size: 20px;
}

#curr_eval {
  background-color: #F0F0F0;
  width: 95%;
  height: 30px;
  text-align: right;
  margin: auto;
  font-size: 20px;
  border-bottom: 1px black solid;
}

.row {
  margin-left: 10px;
}

.nums {
  background-color: #5E5E5E;
  color: white;
  font-size: 24px;
}

.ops {
  background-color: #A3A3A3;
  font-size: 24px;
}

.undo {
  background-color: #ff6666;
  font-size: 24px;  
}

.lside {
  background-color: #c4c4ff;
  font-size: 18px; 
  height: 45px;
}

.func {
  background-color: #c4c4ff;  
}

#equals {
  background-color: #c4c4ff;
  line-height: 50px;
  width: 93%;
  height: 70px;
  font-size: 50px;
  margin: auto;
  margin-top: 5px;  
  padding-top: 0px;
}

.other {
  background-color: white;
}

#neg, #dec, #EE {
  height: 45px;
  font-size: 24px;
}

button {
  border-radius: 8px;
  width: 45px;
  text-align: center;
}

#deg, #rad {
  height: 23px;
  padding-top: 0;
}

#upcoming {
  background-color: white;
  width: 70%;
  font-size: 20px;
  margin: auto;
  margin-top: 20px;
}
              
            
!

JS

              
                $(document).ready(function() {
 
  var exp = false;
  var nthRoot = false;
  var convert = 180/Math.PI;
  var angConvert = Math.PI/180;
  var lastClicked = '';
  //show the clicked button in entry 
  $('.func, .other, .nums, .ops, #EE').not('#log, #ln, #sqrt, #nth_root, #ten_to_x').click(function() {

    if ($(this).is('.nums')) {
      lastClicked = $(this).html();
    }
    
    //if operation hit 1st, add Ans to display
    if ($('#entry').is(':empty') && ($(this).is('.ops, #EE, #fact')) && !$('#curr_eval').is(':empty')) {
      $('#entry').html('Ans');
    }
    
    if ($(this).is('#xsq, #recip, #x_to_y')) {
      return;
    }
    
    //if e^x
    if ($(this).is('#e_to_x')) {
      exp = true;
    }
    
    //if not exponent
    if (!exp) {
      $('#entry').append($(this).html().replace('(-)','-').replace('EE', 'E'));
      // $('#entry').val($('#entry').val() + $(this).html())
        //if trig function
      //need to do calculation, adding * if next to number, like I did for pi
      if ($(this).hasClass('trig')) {
        $('#entry').append('(');
      }
    }
    //if yes exponent
    else if (exp) {
      if ($(this).is('#e_to_x')) {
      $('#entry').append($(this).html().replace('<sup>x</sup>',''))
        return;
    }
      
      
      //if x^y hit first, add Ans if needed, then superscript
      if ($('#entry').is(':empty')) {
        $('#entry').html('Ans');
      } 
      //start the superscript
      if (nthRoot) {
        var superRoot = '<sup>' + $(this).html() + '</sup>&radic;(';
        $('#entry').html($('#entry').html().replace('√(',superRoot));
      
      }
      
      
      if ($(this).is('#neg, #dec, .nums') ) {
        $('#entry').append('<sup>' + $(this).html().replace('(-)','-').replace('EE','E'));
      }
      //end the supercript
      if (!$(this).is('#neg, #dec, .nums'))  {
        $('#entry').append('</sup>'+$(this).html());
        exp = false;
      }
    }
    
    
  }) //end of show the clicked button in entry
  
  //change between deg and rad
  $('#deg,#rad').click(function() {
    $('#deg,#rad').removeClass('mode');
    $(this).addClass('mode');
    convert = ($('#deg').hasClass('mode')) ? 180/Math.PI : 1;
    angConvert = ($('#deg').hasClass('mode')) ? Math.PI/180 : 1;
    console.log('convert = ' + convert);
    console.log('angConvert = ' + angConvert)
  })
  
  // var x = $('#rad').is('.mode') ? 2 : 0;
  // console.log(x)
  
  
  
  
  // 1/x function
  $('#recip').click(function() {
    if ($('#entry').is(':empty')) {
        $('#entry').html('Ans');
      }  
    $('#entry').append('<sup>-1</sup>')
  })
  
  
  // xsq function
  $('#xsq').click(function() {
    if ($('#entry').is(':empty')) {
        $('#entry').html('Ans');
      }  
    $('#entry').append('<sup>2</sup>')
  })
  
  
  // exponent function
  $('#x_to_y').click(function() {
    exp = true;
  })
  
  
  //log and ln function
  $('#log, #ln').click(function() {
    $('#entry').append($(this).html() + '(');
  })
  
  
  //10^x
  $('#ten_to_x').click(function() {
    $('#entry').append('10');
    exp = true;
  })
  
  
  //sqrt
  $('#sqrt').click(function() {
    $('#entry').append('&radic;(');
  })
  
  
  //nth root
  // $('#nth_root').click(function() {
  //  var begin = lastClicked ? ' <sup>'+lastClicked+'</sup>': '';
  //  $('#entry').append(begin+'&radic;(');
  // })
  
  $('#nth_root').click(function() {
    $('#entry').append(' &radic;(');
    nthRoot = true;
    exp = true;
    
   
  })
  
  
  //if trig function
    // $('.trig').click(function() {
    //   $('#entry').append($(this).html()+'(');
    // })
  
  
  //when equals is pushed
  $('#equals').click(function() {
    //bump entry up to curr and curr to prev
    $('#prev_entry').html($('#curr_entry').html());
    $('#prev_eval').html($('#curr_eval').html());
    $('#curr_entry').html($('#entry').html());
    
    //do calculation & put in curr_eval
    var ans = $('#curr_eval').html();
    var val = $('#entry').html().replace(/×/g,'*').replace(/÷/g,'/').replace(/(\d|\!)\(/g,'$1*(').replace('Ans',ans).replace(/([\d]+)π/g,"$1*Math.PI").replace(/π/g,Math.PI).replace(/<\/sup><sup>/g,'').replace(/<sup>/g,'^').replace(/<\/sup>/g,'').replace(/(\(?\d*\.*\d*E?-?[\d]+\)?)\^(\-*[.\d]+)/g, "Math.pow($1, $2)").replace(/(\d+|\(.+\)+)\!/g,'fact($1)').replace(/([\d]+)e/g,'$1*e').replace(/e\^(\-*[.\d]+)/g, "Math.pow(Math.E, $1)").replace(/([\d]+)(acos|asin|atan)/g,'$1*$2').replace(/\b(a[a-z]+)/g,"convert*Math.$1").replace(/([\d]+)(cos|sin|tan)/g,'$1*$2').replace(/\b(cos|sin|tan)\(([\d]+)/g,'Math.$1(($2*angConvert)').replace(/\)(convert|Math)/g,')*$1').replace(/([\d]+)log/g,"$1*log").replace(/log/g,'Math.log10').replace(/([\d]+)ln/g,"$1*Math.log").replace(/ln/g,'Math.log').replace(/(\d+|\))√/g,'$1*√').replace(/√/g,'Math.sqrt');
    // .replace(/^\.E/,'e')
    console.log($('#entry').html())
    console.log(val)
    // console.log(convert)
    // console.log(angConvert)
    try {
      eval(val);
      
      var calculation = Number.isInteger(eval(val)) ? (eval(val).toString().indexOf('e') > 0 ? parseFloat(eval(val)) : parseInt(eval(val))) : parseFloat(eval(val).toPrecision(15));
      //$('#curr_eval').html(calculation.toString().replace('e','E'));
    } 
    catch (e) {
      if (e instanceof SyntaxError) {
        alert(e.message); 
        }
    } //end of try stuff
    
    calculation ? $('#curr_eval').html(calculation.toString().replace('e','E')) : $('#curr_eval').empty();

    //clear entry
    $('#entry').empty();
    val = '';
    
    exp = false;
  })//end of equal functionality
  
  
  //clearall function
  $('#clearall').click(function() {
    $('.output').empty();
  })
  
  
  //clear function
  $('#clear').click(function() {
    var remove = ($('#entry').is(':empty')) ? $('#curr_entry,#curr_eval') : $('#entry') ;
    remove.empty();
    //move prev_entry down to curr_entry
    if ($('#curr_entry').is(':empty')) {
      $('#curr_entry').html($('#prev_entry').html());
      $('#curr_eval').html($('#prev_eval').html());
      $('#prev_entry').empty();
      $('#prev_eval').empty();
    }  
  }) //end of clear function
  
  
  //backspace function
  $('#back').click(function() {
    var str = $('#entry').html();
    if (str.indexOf('</sup>') > -1) {
      str = str.substring(0, str.length - 12);
    }
    else {
      str = str.substring(0, str.length - 1);
    }
    $('#entry').html(str);
  }) //end of backspace function
  
}) //end of doc ready

function fact(n) { 
  return n == 0 ? 1 :  n*fact(n-1)
}
              
            
!
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