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How to add float numbers using JavaScript ?

  • Last Updated : 11 Dec, 2019

Given two or more numbers and the task is to get the float addition in the desired format with the help of JavaScript. There are two methods to solve this problem which are discussed below:

Approach 1:

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Example: This example implements the above approach.




<!DOCTYPE HTML> 
<html
  
<head
    <title
        Float sum with JavaScript.
    </title>
</head
  
<body style = "text-align:center;"
      
    <h1 style = "color:green;"
        GeeksForGeeks 
    </h1>
      
    <p id = "GFG_UP" style =
        "font-size: 15px; font-weight: bold;">
    </p>
      
    <button onclick = "gfg_Run()"
        Click Here
    </button>
      
    <p id = "GFG_DOWN" style = "color:green;
        font-size: 20px; font-weight: bold;">
    </p>
      
    <script>
        var el_up = document.getElementById("GFG_UP");
        var el_down = document.getElementById("GFG_DOWN");
          
        el_up.innerHTML = "Click on the button to get the"
                          + " sum in desired format.";
          
        var val = parseFloat('2.3')+parseFloat('2.4');
        el_down.innerHTML = "2.3 + 2.4 = " + val;
          
        function gfg_Run() {
            el_down.innerHTML = "2.3 + 2.4 = " 
                        + (parseFloat('2.3') + 
                        parseFloat('2.4')).toFixed(2);
        
    </script
</body
  
</html>


Output:



  • Before clicking on the button:
  • After clicking on the button:

Approach 2:

Example: This example implements the above approach.




<!DOCTYPE HTML> 
<html
  
<head
    <title
        Float sum with javascript.
    </title>
</head
  
<body style = "text-align:center;"
      
    <h1 style = "color:green;"
        GeeksForGeeks 
    </h1>
      
    <p id = "GFG_UP" style =
        "font-size: 15px; font-weight: bold;">
    </p>
      
    <button onclick = "gfg_Run()"
        Click Here
    </button>
      
    <p id = "GFG_DOWN" style = "color:green;
        font-size: 20px; font-weight: bold;">
    </p>
      
    <script>
        var el_up = document.getElementById("GFG_UP");
        var el_down = document.getElementById("GFG_DOWN");
          
        el_up.innerHTML = "Click on the button to get the"
                          + " sum in desired format.";
          
        var val = parseFloat('2.3')+parseFloat('2.4');
        el_down.innerHTML = "2.3 + 2.4 = " + val;
          
        function gfg_Run() {
            el_down.innerHTML = "2.3 + 2.4 = " + 
                    Math.round((parseFloat('2.3')
                    + parseFloat('2.4'))*100)/100;
        
    </script
</body
  
</html>


Output:

  • Before clicking on the button:
  • After clicking on the button:



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