<HW3>(50%) done

03/main.js

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+//switch: sizes//////////////////////////////////////////////////////
+let size = prompt('enter ukr size', "");
+switch (size) {
+   case "40":
+      alert('us size = 6(S)');
+      break
+   case "42":
+      alert('us size = 8(M)');
+      break
+   case "44":
+      alert('us size = 10');
+      break
+   case "46":
+      alert('us size = 12(L)');
+      break
+   case "48":
+      alert('us size = 14');
+      break
+   case "50":
+      alert('us size = 16(XL)');
+      break
+   case "52":
+      alert('us size = 18');
+      break
+   case "54":
+      alert('us size = 20(XXL)');
+
+}
+
+
+//switch: if//////////////////////////////////////////////////////
+let color = prompt("Введите цвет");
+if (color === "red") {
+   document.write("<div style='background-color: red;'>красный</div>")
+}
+
+else if (color === "black") {
+   document.write("<div style='background-color: black; color: white;'>черный</div>");
+}
+else if (color === "blue") {
+   document.write("<div style='background-color: blue;'>синий</div>");
+}
+else if (color === "green") {
+   document.write("<div style='background-color: green;'>зеленый</div>");
+}
+else {
+   document.write("<div style='background-color: gray;'>Я не понял</div>");
+}
+
+
+//prompt: or//////////////////////////////////////////////////////
+let age = prompt('Сколько тебе лет?');
+if (age > 0) { alert(`Ты ${2022 - age} года рождения!`) }
+else if (age === "0" || age === "") { alert('ошибка') }
+
+
+//confirm: or this days///////////////////////////////////////////
+let question = confirm('шоппинг?') ? alert('летс-гоу!!!') : alert('ты-бяка');
+
+
+//confirm: if this days///////////////////////////////////////////
+let question1 = confirm('шоппинг?');
+if (question1 === true) { alert('летс-гоу!!!') }
+else if (question1 === false) { alert('ты-бяка') }
+
+
+//triple prompt///////////////////////////////////////////////////
+let firstname = prompt("ваше имя?");
+let lastname = prompt("ваше фамилия?")
+let patronymic = prompt("ваше отчество?")
+alert(firstname + " " + lastname + " " + patronymic)
+
+
+//default: or/////////////////////////////////////////////////////
+const default1 = "иван"
+const default2 = "иванов"
+const default3 = "иванович"
+let firstname1 = prompt("ваше имя?") || default1;
+let lastname1 = prompt("ваше фамилия?") || default2;
+let patronymic1 = prompt("ваше отчество?") || default3;
+alert(firstname1 + " " + lastname1 + " " + patronymic1)
+
+
+//default: if/////////////////////////////////////////////////////
+const default1 = "иван"
+const default2 = "иванов"
+const default3 = "иванович";
+let firstname = prompt("ваше имя?")
+if (firstname === true) { firstname }
+else if (firstname === "" || firstname === null) { firstname = default1 };
+let lastname = prompt("ваше фамилия?")
+if (lastname === true) { lastname }
+else if (lastname === "" || lastname === null) { lastname = default2 };
+let patronymic = prompt("ваше отчество?")
+if (patronymic === true) { patronymic }
+else if (patronymic === "" || patronymic === null) { patronymic = default3 };
+alert(firstname + " " + lastname + " " + patronymic)
+
+
+
+//login and password//////////////////////////////////////////////
+let login = prompt('введите логин');
+if (login === "admin") { alert("ok.введите пароль.") }
+else if (login !== "admin") { alert("неверный логин!") }
+let password = prompt('введите пароль');
+if (login === "admin" && password === "qwerty") { alert("вы успешно ввели логин и пароль!") }
+else if (password === "qwerty") { alert("вы успешно ввели пароль!") }
+else if (password !== "qwerty") { alert("неверный пароль!") }
+