main.js

function calculateQuadraticEquation(){
    let a = +window.a.value;
    let b = +window.b.value;
    let c = +window.c.value;
    let result = getResult(a,b,c);
    window.equation.textContent = `${a}*x^2 + (${b})*x + (${c}) = 0`;
    let span = window.result;
    span.textContent = "х = "+JSON.stringify(result);
}

function calculateAverageRating(){
    let marks = window.marks.value.split("").map(Number).filter((n)=> !isNaN(n) && n > 0);
    let averageMark = getAverageMark(marks);
    window.averageMark.textContent = averageMark;
}

function calculateDrinkTask(){
    let name = window.personName.value;
    let dateOfBirthday = new Date(window.dateOfBirthday.value);
    let drink = askDrink(name, dateOfBirthday);
    window.drink.textContent = drink;
}