(function() {

    //1000000000000000
    const a = 999999999999999.99

    //99999999999999.98
    const b = 99999999999999.99

    //999999999999999
    const c = 999999999999999

    //'999999999999999.99'
    const d = '999999999999999.99'

    console.log(a);
    console.log(b);
    console.log(c);
    console.log(d);
}
)();