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+// Additional task
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+var additionalTask = prompt("switchSizes, switch:if, prompt:or, confirm: or this days, confirm: if this days, triple prompt, default: or, default: if, login and password, currency calc && currency calc: improved, currency calc: two rates, currency calc: if, target, blue belt assignment'")
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+switch(additionalTask) {
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+
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+case 'switch:sizes' :
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+
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+let size = prompt('Enter your size', " ");
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+switch(size) {
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+ case '40' : alert('Your size in Norvay 34 S');
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+ break;
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+ case '42' : alert('Your size in Norvay 36 M');
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+ break;
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+ case '44' : alert('Your size in Norvay 38');
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+ break;
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+ case '46' : alert('Your size in Norvay 40 L');
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+ break;
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+ case '48' : alert('Your size in Norvay 42');
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+ break;
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+ case '50' : alert('Your size in Norvay 44 XL');
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+ break;
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+ case '52' : alert('Your size in Norvay 46');
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+ break;
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+ case '54' : alert('Your size in Norvay 54 XXL');
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+ break;
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+ default : alert('Sorry but you size not included in our table');
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+}
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+
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+break;
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+
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+case 'switch:if' :
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+
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+var color = prompt("Введите цвет","");
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+ if (color == "red") {
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+ document.write("<div style='background-color: red;'>красный</div>");
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+ document.write("<div style='background-color: black; color: white;'>черный</div>");
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+}
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+else if (color == "black") {
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+
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+ document.write("<div style='background-color: black; color: white;'>черный</div>");
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+}
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+else if (color == "blue") {
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+
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+ document.write("<div style='background-color: blue;'>синий</div>");
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+ document.write("<div style='background-color: green;'>зеленый</div>");
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+}
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+else if (color == "green"){
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+
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+ document.write("<div style='background-color: green;'>зеленый</div>");
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+}
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+else{
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+ document.write("<div style='background-color: gray;'>Я не понял</div>");
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+}
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+break;
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+
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+case 'prompt:or' :
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+
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+var yearNow = 2020;
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+var personYears;
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+var howOldPerson = +prompt('Сколько вам лет') || alert('Error');
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+var personYears = yearNow - howOldPerson;
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+ if(howOldPerson!=null) alert('You born in ' +personYears );
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+
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+ break;
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+
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+case 'confirm: or this days' :
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+
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+var shoping = confirm('Shoping?') || alert('You are a caca');
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+alert('You are the best');
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+
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+break;
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+
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+case 'confirm: if this days' :
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+
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+let soping = confirm('Shoping?');
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+ if (soping==false) {
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+alert('You are a caca');
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+}
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+else {alert('You are the best');
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+}
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+
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+break;
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+
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+case 'triple prompt' :
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+
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+var name = prompt("Enter you name", "");
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+var surname = prompt("Enter you surname", "");
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+var fathername = prompt("Enter you fathername", "");
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+alert(name + ' ' + surname + ' ' + fathername);
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+break;
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+
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+
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+case 'default: or' :
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+
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+var name = prompt("Enter you name") || "Ivan";
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+var surname = prompt("Enter you surname") || "Ivanov";
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+var fatherName = prompt("Enter you fathername") || "Ivanovich";
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+alert(surname + ' ' + name + ' ' + fatherName);
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+ break;
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+
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+
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+case 'default: if' :
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+
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+var surnameOne = prompt("Enter you surname");
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+var nameOne = prompt("Enter you name");
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+var fatherNameOne = prompt("Enter you fathername");
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+
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+if (!surnameOne) { surnameOne = 'Ivanov'}
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+if (!nameOne) {nameOne = 'Ivan'}
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+if (!fatherNameOne) {fatherNameOne = 'Ivanovich'}
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+alert(surnameOne + ' ' + nameOne + ' ' + fatherNameOne);
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+break;
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+
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+case 'login and password' :
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+
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+var name = 'stas';
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+var nameTwo = 'alex';
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+var nameThree = 'pety';
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+var passworld = 1234;
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+var passworldTwo = 777;
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+var passworldThree = 'qwerty'
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+var loginName = prompt("Enter you name", "") || alert("Enter you name")
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+var loginPassworld = prompt("Enter you passworld", "") || alert("Enter you passworld")
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+
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+ if (name!==loginName && passworld==loginPassworld || nameTwo!==loginName && passworldTwo==loginPassworld || nameThree!==loginName && passworldThree==loginPassworld){
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+alert("Wrong name")
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+}
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+else if(name==loginName && passworld!==loginPassworld || nameTwo==loginName && passworldTwo!==loginPassworld || nameThree==loginName && passworldThree!==loginPassworld ){
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+alert('Passworld is wrong')
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+}
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+else if (name==loginName && passworld==loginPassworld || nameTwo==loginName && passworldTwo==loginPassworld || nameThree==loginName && passworldThree==loginPassworld){
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+alert("Cam in")
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+}
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+else if (name!=loginName && passworld!=loginPassworld) {
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+ alert('anncorect name and passworld')
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+}else {alert('Cansel')}
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+break;
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+
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+case 'currency calc && currency calc: improved' :
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+
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+
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+var сurrency = prompt("Enter you currency usd or eur").toLowerCase();
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+switch(сurrency) {
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+ case "usd" : currency = 29
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+ break;
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+ case "eur" : currency = 33
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+}
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+var sum = + prompt("Enter the amount you want to transfer to UAH");
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+var dubget = sum * currency
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+alert(dubget)
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+break;
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+
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+case 'currency calc: two rates' :
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+
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+var сurrency = prompt("Enter you currency usd or eur").toLowerCase();
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+switch(сurrency) {
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+ case "usd" : currency = 29
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+ break;
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+ case "eur" : currency = 33
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+}
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+var sum = + prompt("Enter the amount you want to transfer");
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+var dubget = confirm("Click OK if you want to sell or Cancel if you want to buy") ? dubgett = sum * currency : dubggett = sum / currency;
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+alert(dubget)
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+break;
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+
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+
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+case 'currency calc: if' :
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+
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+var currencyUsd = 29;
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+var currencyEur = 33
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+var currencyOne = prompt("Enter you currency usd or eur").toLowerCase();
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+var sum = + prompt("Enter the amount you want to transfer");
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+var dubgett = confirm("Click OK if you want to sell or Cancel if you want to buy")
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+if (currencyOne === "usd" && sum>0 && dubgett) { var summa = sum * currencyUsd}
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+if (currencyOne === "usd" && sum>0 && !dubgett) {var summa = sum / currencyUsd}
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+if (currencyOne === "eur" && sum>0 && dubgett) {var summa = sum * currencyEur}
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+if (currencyOne === "eur" && sum>0 && !dubgett) {var summa = sum / currencyEur}
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+alert(summa)
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+break;
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+
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+case 'scissors' :
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+
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+var game = prompt("Choose one from rock, scissors, paper").toLowerCase();
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+var enemy = Math.floor(Math.random()*3);
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+if (enemy == 0) {enemy = "rock"}
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+{if (enemy == "rock" && game == "paper") alert("You have won")}
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+{if (enemy == "rock" && game == "rock") alert("Draw")}
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+{if (enemy == "rock" && game == "scissors") alert("Opponent defeated")}
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+if (enemy == 1) {enemy = "paper"}
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+{if (enemy == "paper" && game == "paper") alert("Draw")}
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+{if (enemy == "paper" && game == "rock") alert("Opponent defeated")}
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+{if (enemy == "paper" && game == "scissors") alert("You have won")}
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+if (enemy == 2 ) {enemy = "scissors"}
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+{if (enemy == "scissors" && game == "paper") alert("Opponent defeated")}
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+{if (enemy == "scissors" && game == "rock") alert("You have won")}
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+{if (enemy == "scissors" && game == "scissors") alert("Draw")}
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+break;
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+
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+
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+case 'blue belt assignment' :
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+
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+var ratios = {
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+ usdSell: 25.6,
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+ eurSell: 29,
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+ usdBay: 27.8,
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+ eurBay: 31,
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+}
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+var currency = prompt("Enter you currency usd or eur").toLowerCase();
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+var sum = +prompt("Enter the amount you want to transfer");
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+let cashUsbSell = sum * ratios["usdSell"];
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+let cashUsdBay = sum/ratios["usdBay"];
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+let cashEurSell = sum * ratios["eurSell"];
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+let cashEurBay = sum/ratios["eurBay"];
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+ if (currency == 'usd') confirm("Click OK if you want to sell or Cancel if you want to buy") ?alert("Your cash on sale is" + " " + cashUsbSell) : alert("Your cash from the purchase is" + " " + cashUsdBay);
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+if (currency == 'eur') confirm("Click OK if you want to sell or Cancel if you want to buy") ?alert("Your cash on sale is" + " " + cashEurSell) : alert("Your cash from the purchase is" + " " + cashEurBay);
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+break;
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+
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+case 'target' :
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+// Написать программу которая будет склонять слово товар в зависимости от количества
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+// товаров в корзине. Например 1 - товар, 4 - товара, 6 - товаров.
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+
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+var target = ['товар', 'товаров', 'товара']
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+var number = + prompt("Введите количество товаров")
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+tipe = Math.abs(number%100)
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+var numbers = tipe%10
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+ if (tipe>10 && tipe<20 || numbers>4 && numbers<11) {
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+ alert(number + ' ' + target[1])
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+
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+}else if (numbers > 1 && numbers < 5) {
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+ alert(number + ' ' + target[2])
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+}else if (numbers == 1) {
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+alert(number + ' ' + target[0])
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+}else if (numbers == 0 ) {alert(number + ' ' + target[1])}else {alert("error")}
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+break;
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+
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+}
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