A simple program that I wrote using JavaScript that will ask the user to give three numbers and then the program will solve for the sum of three numbers and display the results on the screen.
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Sample Program Output
Program Listing
index.html
<!doctype html>
<html>
<head>
<title>Addition of Three Numbers in JavaScript </title>
</head>
<script>
function add_three_number(){
var a,b,c,sum;
a=Number(document.getElementById("first").value);
b=Number(document.getElementById("second").value);
c=Number(document.getElementById("third").value);
sum= (a+b+c);
document.getElementById("answer").value= sum;
}
</script>
<body>
<h2>Addition of Three Numbers in JavaScript </h2>
<br><br>
Enter the First number : <input id="first"><br>
Enter the Second number: <input id="second"><br>
Enter the Third number: <input id="third"><br>
<br><br>
<button onclick="add_three_number()">Sum All</button>
<input id="answer">
</body>
</html>
