function printBdaySong(name, times) {
    for (let i = 0; i < times; i++) {
        document.write("Happy birthday to you.<br>");
        document.write("Happy birthday to you.<br>");
        document.write("Happy birthday dear " + name + ".<br>");
        document.write("Happy birthday to you.<br>");

    }
}

//bday("John");

//var functions = [];

//functions.push(printBdaySong);

//document.write(functions);

//functions[0]("John", 2);

var users = [];

function addToList(namepass, splitchar) {
    users.push(namepass.split(splitchar));
}

addToList("pera|peric", "|");
addToList("bora|boric", "|");
addToList("mika|mikic", "|");
addToList("lepa|lepic", "|");


function printUserList(userlist) {
    for (let i = 0; i < userlist.length; i++) {
        document.write("Korisnicko ime je " + userlist[i][0] + ".<br>");
        document.write("Lozinka je " + userlist[i][1] + ".<br>");
    }
}

//printUserList(users);

function combineString(string1, string2) {
    return string1.substring(0, 3) + string2.substring(string2.length - 3, string2.length);
}

//document.write(combineString("abcdef", "ghijkl"));

function acronym(string) {
    var split = string.split(" ");
    var acr = "";
    for (let i = 0; i < split.length; i++) {
        acr += split[i].substring(0, 1).toUpperCase();
    }
    return acr + "<br>";
}

document.write(acronym("random access memory"));

var ocene = [8, 7, 6, 9, 8, 10, 8];
var ime_prez = ["Marko", "Markovic"];

function printStudentInfo(name, grades) {

    function averageGrade(grades) {
        var sum = 0;
        for (let i = 0; i < grades.length; i++) {
            sum += grades[i];
        }
        return sum / grades.length;
    }

    document.write(name[0] + " " + name[1] + " ima prosek " + averageGrade(grades) + ".<br>");
}

printStudentInfo(ime_prez, ocene);


var drzave = {
    1: "RS",
    2: "RU",
    3: "UK",
    4: "ESP"
};

var gradovi = [
    ["London", 3],
    ["Novi Sad", 1],
    ["Moskva", 2],
    ["Madrid", 4]
];

function matchCityState(cities, states) {
    for (let i = 0; i < cities.length; i++) {
        document.write(cities[i][0] + " - " + drzave[cities[i][1]] + "<br>");
    }
}

matchCityState(gradovi, drzave);


function printHeadings(level) {
    for (let i = 1; i <= level; i++) {
        document.write("<h" + i + ">Ovo je generisani naslov " + i + ". nivoa</h" + i + ">");
    }
}

printHeadings(5);

function printHeadingsRange(start, end) {
    for (let i = start; i <= end; i++) {
        document.write("<h" + i + ">Ovo je generisani naslov " + i + ". nivoa</h" + i + ">");
    }
}

printHeadingsRange(2, 4);


function containsString(string1, string2) {
    if (string1.toLowerCase().indexOf(string2) != -1) {
        return true;
    } else return false;
}

//document.write(containsString("Dobar dan", "dobar"));

function checkJMBG(jmbg) {
    var string = jmbg.toString();
    var dd = string.substring(0, 2);
    var mm = string.substring(2, 4);
    var ggg = string.substring(4, 7);
    var bbb = string.substring(9, 12);
    var dateOfBirth = dd + "." + mm + "." + 1 + ggg + ".";
    var sex;
    var b1 = parseInt(bbb.substring(0, 1));
    if ((b1 >= 0 && b1 <= 4)) {
        sex = "muški";
    } else if ((b1 >= 5 && b1 <= 9)) {
        sex = "ženski";
    }
    document.write("<p>Osoba je rodjena " + dateOfBirth + " i njen pol je " + sex + ".</p>");
}

checkJMBG(2604988800074);


function getHttpGet (url) {
    split = url.split("&");
    split[0] = split[0].substring(1);
    var result = split[0] + "<br>" + split[1] + "<br>";
    return result;
}

document.write(getHttpGet("?ime=sinisa&prezime=mihajlovic"));


function toWeekend () {
    var currentDate = new Date();
    var day = currentDate.getDay();
    var daysRemaining = 6 - day - 1;
    document.write("Preostalo je " + daysRemaining + " dana do vikenda.")
}

toWeekend();