# Basic Algorithm Scripting: Convert Celsius to Fahrenheit

Tell us what’s happening:

SyntaxError: unknown: Identifier ‘fahrenheit’ has already been declared (3:6)

1 | function convertToF(celsius) {
2 | var fahrenheit = celsius * (9 / 5) + 32;

3 | let fahrenheit;
| ^
4 | return fahrenheit;
5 | }
6 |

``````
function convertToF(celsius) {
var fahrenheit = celsius * (9 / 5) + 32;
let fahrenheit;
return fahrenheit;
}

convertToF(30);

``````

User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.116 Safari/537.36`.

Challenge: Convert Celsius to Fahrenheit

you need to remove this as you already have declared it with var

Try something like this:

``````
function celTo(celsius) {
return celsius * 9/5 + 32;
}

console.log(celTo(-30));
console.log(celTo(-20));
console.log(celTo(-10));
console.log(celTo(0));
``````

Try and compare the code

It is great that you solved the challenge, but instead of posting your full working solution, it is best to stay focused on answering the original poster’s question(s) and help guide them with hints and suggestions to solve their own issues with the challenge.

We are trying to cut back on the number of spoiler solutions found on the forum and instead focus on helping other campers with their questions and definitely not posting full working solutions.

Thank you for understanding.

1 Like

ah fair enough!! sorry about that