How do I simplify fractions?

Question

I've been working for awhile on a huge mathematical multitool and I'm making a fraction simplifier in it (all with alerts). I tried the following, what did I do wrong?

if (confirm("Confirm to select a program\nCurrent program: Fraction Simplifier") == true) {
    var numerator = prompt("Enter the numerator");
    var denominator = prompt("Enter the denominator");
    var nFrac = numerator;
    var dFrac = denominator;
    simpFrac();
    alert(numerator + "/" + denominator + " simplified is " + nFrac + "/" + dFrac);
};
function simpFrac() {
    for (var i = 1; i < dFrac; i++) {
        fracV = fracV + 1;
        if (Number.isInteger(nFrac / fracV) && Number.isInteger(dFrac / fracV)) {
          nFrac = nFrac / fracV;
          dFrac = dFrac / fracV;  
        };
    };
};

You forgot to explain the _Problem_ you're having with this code. — tkausl, Jan 25 '23 at 16:14
Adding parameters to `simpFrac` instead of using globals is advisable. — Lain, Jan 25 '23 at 16:16
Check the console. _"Uncaught ReferenceError: fracV is not defined",_ — 001, Jan 25 '23 at 16:16
My JS is a bit rusty, byut I;m guessing you need a `let fracV;` as first line in your simpFrac — Martijn, Jan 25 '23 at 16:17
Also, please use full names: `simpFrac` -> `simplifyFraction`. Better names are always good. You dont have to pay per byte — Martijn, Jan 25 '23 at 16:17

Hyyped · Answer 1 · 2023-01-25T17:09:25.173

1

someone answered and deleted their answer, I implemented their method. It worked. Changed to

if (confirm("Confirm to select a program\nCurrent program: Fraction Simplifier") == true) {
    if (confirm("Confirm to select a program\nCurrent program: Fraction Simplifier") == true) {
    var numerator = prompt("Enter the numerator");
    var denominator = prompt("Enter the denominator");
    var GCD = (a, b) => b ? GCD(b, a % b) : a;
    let div = GCD(numerator, denominator);
    alert(numerator + "/" + denominator + " simplifies to " + numerator / div + "/" + denominator / div + ".");

edited Jan 25 '23 at 17:09

answered Jan 25 '23 at 17:08

Hyyped

33
4

1

Glad to see my answer helped. – Unmitigated Jan 25 '23 at 19:55
@Unmitigated, ah that confused me. – President James K. Polk Jan 25 '23 at 23:29
strange, answer disappeared on my pov and now its back – Hyyped Jan 26 '23 at 13:26

score 0 · Accepted Answer · answered Jan 25 '23 at 16:17

0

Divide the numerator and the denominator by the GCD.

const GCD = (a, b) => b ? GCD(b, a % b) : a;
let numerator = 15, denominator = 18;
let div = GCD(numerator, denominator);
console.log(`${numerator}/${denominator} simplifies to ${numerator/div}/${denominator/div}`);

answered Jan 25 '23 at 16:17

Unmitigated

76,500
11
62
80

not that simple – epascarello Jan 25 '23 at 16:18
2

While this might or might not work, it does not answer the question. – JavaScript Jan 25 '23 at 16:18
@epascarello So much for that... – Unmitigated Jan 25 '23 at 19:52
@tadman Why not? – Unmitigated Jan 25 '23 at 19:53
1

@epascarello Do you have an example? – Unmitigated Jan 25 '23 at 20:17
1

@epascarello: How is not that simple? – President James K. Polk Jan 25 '23 at 23:26

How do I simplify fractions?

2 Answers2