CODEWITHSUNDEEP
javascriptfunction
Caleb Norris
Caleb Norris

Reputation: 1

Function is giving the wrong answer to my equation?

Doing a Celsius to Fahrenheit converter and reverse. and code seems to be working fine but when I give 20 under the F to C function it returns 2.2222 instead of 68 like it should, does the same with both equations.

let num = userInput
let numF = num * 9 / 5 + 32;
let numC = num - 32 * 5 / 9;




 celci = (num) => {
    console.log('Enter temp to convert')

    if (num <= 0 || num >= 0) {
        return numF
    }
    }
 if (num === 'F') {
    celci(num)
    }

If I enter F it returns 'Enter temp to convert' like it should, but when I give it a number it returns the completely wrong answer.

Upvotes: 0

Views: 54

Answers (2)

Shuvashish Paul Sagar
Shuvashish Paul Sagar

Reputation: 31

There is a mistake in the precedence of the operators. It is better to use brackets in complex equations. You should use:

let numC = (num - 32)* (5/ 9);

Upvotes: 0

RobG
RobG

Reputation: 147413

Be careful of operator precedence. * and \ are performed before + and - (which is the same as for mathematic equations). So in:

num - 32 * 5 / 9

your equation is effectively:

num - (32 * 5 / 9)

but should be:

(num - 32) * 5 / 9;

The first equation should work as the + is at the end anyway.

Upvotes: 1

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