Karthikaaa.github.io/index.html at master · Karthikaaa/Karthikaaa.github.io · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Calculator</title>
</head>
<body>
 <div class="row">
   <div class="col-md-4 col-md-offset-4">
     <div class="row">

         <div class="col-md-3 col-md-4"><input type="button" name="seven" value="   7   " OnClick="input('7')"><input type="button" name="eight" value="   8    " OnClick="input('8')"><input type="button" name="nine" value="   9    " OnClick="input('9')"><input type="button" name="plus" value="      +     " OnClick="operator('+')"></div>
         <div class="col-md-3 col-md-4"><input type="button" name="four" value="   4    " OnClick="input('4')"><input type="button" name="five" value="   5    " OnClick="input('5')"><input type="button" name="six" value="   6    " OnClick="input('6')"><input type="button" name="minus" value="     -       " OnClick="operator('-')"></div>
         <div class="col-md-3 col-md-4"><input type="button" name="one" value="   1    " OnClick="input('1')"><input type="button" name="two" value="   2    " OnClick="input('2')"><input type="button" name="three" value="   3    " OnClick="input('3')"><input type="button" name="multiply" value="      *      " OnClick="operator('*')"></div>
         <div class="col-md-3 col-md-4"><input type="button" name="zero" value="   0    " OnClick="input('0')"><input type="button" name="equal" value="         =          " OnClick="operator('=')"><input type="button" name="div" value="      /       " OnClick="operator('/')"></div>

     </div>
   </div>
 </div>#hello
     <script>
         num1=0;
         num2=0;
         operator=0;
         flag=0;

         function input(key)
         {
          if(flag==1)
           {
             num1='';
             num2='';
             operator='';
            }
           if(operator==='')
           {
             num1=num1+key;
           }
           else
           {
             num2=num2+key
           }
            display(num1+""+operator+""+num2);
           }


           function operate(symbol)
           {
            operator=symbol;
            display(num1+""+operator);
           }


            function calculate()
            {
              var x = parseInt(num1);
              var y = parseInt(num2);
              if(operator==='+')
               res=x+y;
              if(operator==='-')
               res=x-y;
               if(operator==='8')
               res=x8y;
              if(operator==='/')
               { if(y==0)
                  {
                     flag=1;
                     display("error- cannot divide by zero");
                     return;
                  }
                  else
                  {
                    res=x/y;
                  }
            }
</script>
</body>
</html>