Question

In: Computer Science

Write a defining table and a JavaScript program that computes and outputs the rate of change...

Write a defining table and a JavaScript program that computes and outputs the rate of change of a price. The program must allow the user to enter a previous price and a current price. The formula for the rate of change is

rateOfChange =  currPrice - prevPrice

prevPrice

Your program should allow a user to enter real numbers such as 7.54. If you wish, you may use the following HTML code in your program.

<!DOCTYPE HTML>
<html lang="en-us">
<head>
<meta charset="utf-8">
<title>Rate of Change</title>
<script>

// Your JavaScript function belongs here.

</script>
</head>

<body>
    <h1>Rate of Change</h1>
    Previous Price <input type="text" id="prevPrice"><br>
    Current Price <input type="text" id="currPrice"><br>
    <button type="button" onclick="computeRateOfChange()">Rate of Change</button><br>
    Rate of Change <div id="rate"></div>
</body>
</html>
Test Cases
Inputs Output
previous current
70.5 72.2 0.0241
96 91.4 -0.0479

Solutions

Expert Solution

<!DOCTYPE HTML>
<html lang="en-us">
<head>
<meta charset="utf-8">
<title>Rate of Change</title>
<script>

function computeRateOfChange(){
   var previousPrice = parseInt(document.getElementById("prevPrice").value);
   var currentPrice = parseInt(document.getElementById("currPrice").value);
   var rateOfChange = currentPrice-previousPrice;
   document.getElementById("rate").innerHTML=rateOfChange;
}

</script>
</head>

<body>
<h1>Rate of Change</h1>
Previous Price <input type="text" id="prevPrice"><br>
Current Price <input type="text" id="currPrice"><br>
<button type="button" onclick="computeRateOfChange()">Rate of Change</button><br>
Rate of Change
   <div id="rate"></div>
</body>
</html>

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venereology answered 6 months ago
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