Javascript 3

 <!DOCTYPE html>

<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <Label>Number</Label>
    <input id="number" type="number" style="height: 200px;" placeholder="Pease Inpute Number" value=""/>
    <button onclick="Sum();">Sum</button>
    <br/>
    <label id="result"></label>
   
    <script>
        let y=0;
        function Sum(){
        //let number=prompt("Please Inpute Number");
        let number=document.getElementById("number");
        let sum=0;
        for(let i=0;i<number.value.length;i++){
            sum=sum+parseInt(number.value[i]);
        }
        number.style.height="400px";
        document.getElementById("result").innerHTML="Sum="+sum;
       // document.writeln(sum);
        }      
       
    </script>
</body>
</html>

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