Js-quadratic-function/script.js at main · Levaij/Js-quadratic-function · GitHub

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const { match } = require("assert")

function kwadratowa(){

    var a = parseFloat(prompt("Give a (f(x) = ax² + bx + c)"))
    var b = parseFloat(prompt("Give b (f(x) = ax² + bx + c)"))
    var c = parseFloat(prompt("Give c (f(x) = ax² + bx + c)"))

    var standardform = (`f(x) = ${a}x² + ${b}x + ${c}`)

    var delta = (b * b - (4 * a * c))
    var pdelta = (Math.sqrt(delta))

    var p = (-b / (2 * a))
    var q = (-delta / (4 * a))

    if (b <= 0){

        var bminus = b * -1
        var po = (`${bminus} / (2 * ${a}) = ${p}`)

    }
    else {

        var po = (`-${b} / (2 * ${a}) = ${p}`)

    }

    if (delta <= 0){

        var deltaminus = delta * -1

        var qo = (`${deltaminus} / (4 * ${a}) = ${q}`)

    }
    else {

        var qo = (`-${delta} / (4 * ${a}) = ${q}`)

    }

    var vertexform = (`f(x) = ${a}(x - ${p})² + ${q}`)

    var deltao = (`Δ = ${b}² - 4 * ${a} * ${c} = ${delta}`)

    if (delta > 0){

        var x1 = ((-b - pdelta) / (2 * a))
        var x2 = ((-b + pdelta) / (2 * a))

        if (b <= 0){

            var bminus = b * -1

            var x1o = (`${bminus} - ${pdelta} / (2 * ${a}) = ${x1}`)
            var x2o = (`${bminus} + ${pdelta} / (2 * ${a}) = ${x2}`)

        }
        else {

            var x1o = (`-${b} - ${pdelta} / (2 * ${a})`)
            var x2o = (`-${b} + ${pdelta} / (2 * ${a})`)

        }

        var factoredform = (`f(x) = a(x - ${x1})(x - ${x2})`)

        document.getElementById("forms").innerHTML= (`Standard Form: ${standardform} <br> Factored Form: ${factoredform} <br> Vertex Form: ${vertexform}`)
        document.getElementById("other").innerHTML= (`Zero (x1): ${x1o} <br> Zero (x2): ${x2o} <br> <br> Delta: ${deltao}`)
        document.getElementById("pq").innerHTML= (`p: ${po} <br> p: ${qo}`)
        document.getElementById("abc").innerHTML= (`a = ${a} <br> b = ${b} <br> c = ${c}`)

    }
    else if (delta = 0){

        var x0 = (-b / (2 * a))

        if (b <= 0){

            var bminus = b * -1

            var x0o = (`${bminus} / (2 * ${a})`)

        }
        else {
            var x0o = (`-${b} / (2 * ${a})`)
        }

        var factoredform = (`f(x) = a(x - ${x0})²`)

        document.getElementById("forms").innerHTML= (`Standard Form: ${standardform} <br> Factored Form: ${factoredform} <br> Vertex Form: ${vertexform}`)
        document.getElementById("other").innerHTML= (`Zero (x0 = (x1 and x2)): ${x0o} <br> <br> Delta: ${deltao}`)
        document.getElementById("pq").innerHTML= (`p: ${po} <br> p: ${qo}`)
        document.getElementById("abc").innerHTML= (`a = ${a} <br> b = ${b} <br> c = ${c}`)

    }
    else{
        document.getElementById("forms").innerHTML= (`Error, Can give zeros cuz delta is negative (-Δ) and cant give sqrt`)
        document.getElementById("other").innerHTML- (`Delta: ${deltao}`)
        document.getElementById("pq").innerHTML= (`p: ${po} <br> p: ${qo}`)
        document.getElementById("abc").innerHTML= (`a = ${a} <br> b = ${b} <br> c = ${c}`)
    }
}