Answer :
In order to develop a JavaScript that converts Celsius to Fahrenheit and Fahrenheit to Celsius, two functions must be created: "Celsius" and "Fahrenheit". Here is how the program can be coded:HTML Form with textboxes and buttons:```
```JavaScript that converts Celsius to Fahrenheit:```
function toFahrenheit() {
var temp = parseFloat(document.getElementById("temp").value);
var fahr = (temp * 9/5) + 32;
document.getElementById("main_answer").innerHTML = fahr + "°F";
document.getElementById("conclusion").innerHTML = "Converted to Fahrenheit";
}
```JavaScript that converts Fahrenheit to Celsius:```
function toCelsius() {
var temp = parseFloat(document.getElementById("temp").value);
var celsius = (temp - 32) * 5/9;
document.getElementById("main_answer").innerHTML = celsius + "°C";
document.getElementById("conclusion").innerHTML = "Converted to Celsius";
}
```The "temp" variable retrieves the value of the textbox from the HTML form.
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