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+//1.assign: evaluation
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+// var a = 5;
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+// var b, c;
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+// b = a * 5;
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+// b = c = b/2;
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+// console.log(b, c);
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+
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+//2.semicolon: error
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+// const hey = 'hey'
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+// const you = 'hey'
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+// const heyYou = hey + ' ' + you
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+// [‘h’, ‘e’, ‘y’].forEach((letter) => console.log(letter))
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+
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+//3.semicolon: mistake
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+// const degC = (degF) => {
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+// return degF - 32 * 5/9;
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+// }
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+// console.log(degC(36));
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+
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+//4.Number: age
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+// let age = parseInt(+prompt('How old are you?'));
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+// let currentYear = (new Date()).getFullYear();
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+// if(age > 0){
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+// alert(`${currentYear - age} is your year of Born`);
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+// }
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+// else {
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+// alert('You made mistake');
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+// }
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+
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+
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+//5.Number: temperature
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+// let degC = +prompt('How many degrees in Celsius?');
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+// let degF = degC * 1.8 + 32;
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+// alert(`${degF} degrees in Fahrenheit`);
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+
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+//6.Number: divide
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+// function divide(a, b) {
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+// return Math.floor(a/b);
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+// }
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+// console.log(divide(5, 2));
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+
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+//7.Number: odd
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+// let num = +prompt('Write your number:');
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+// if (isNaN(num)) {
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+// alert('Error');
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+// }
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+// else if (!(Number.isInteger(num))) {
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+// alert('Number is not integer');
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+// }
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+// else if(num % 2 == 0) {
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+// alert('Your number is even');
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+// }
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+// else {
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+// alert('Your number is odd');
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+// }
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+
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+//8.String: greeting
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+// let userName = prompt('What is your name?');
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+// alert(`Hello ${userName}! Have a nice day!`);
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+
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+//9.String: lexics
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+// let text = prompt('Say something');
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+// console.log(text.indexOf('el'));
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+
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+//10.confirm
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+// let result = confirm('Are you here?');
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+// alert(typeof result);
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+// alert(result);
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+
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+//11.Boolean
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+// let happy = confirm('Are you happy?');
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+// let pet = confirm('Do you have pet?');
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+// let cat = confirm('Is it cat?');
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+// let dog = confirm('Is it dog');
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+// console.log(happy, pet, cat, dog);
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+
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+//12.Boolean: if
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+// let man = confirm('Are you a man?');
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+// let woman = confirm('Are you a woman?');
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+// if(man === true) {
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+// alert('You are a man');
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+// }
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+// else {
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+// alert('You are a woman');
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+// }
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+
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+//13.Array: real
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+// let colors = ['blue', 'yellow', 'pink', 'red', 'white', 'black', 'green', 'gray'];
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+
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+//14.Array: booleans
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+// let arr = ['happy', 'pet', 'cat', 'dog', 'man', 'woman'];
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+
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+//15.Array: plus
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+// let arr = ['happy', 'pet', 'cat', 'dog', 'man', 'woman'];
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+// arr[2] = `${arr[0]} ${arr[1]}`;
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+// let arrNum = [1, 2, 4, 5];
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+// arrNum[2] = arrNum[0] + arrNum[1];
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+// console.log(arr, arrNum);
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+
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+//16.Array: plus string
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+// let arr = ['a', 'b', 'c', '1', '2', '3'];
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+// arr[3] = arr[0] + arr[1] + arr[2];
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+// console.log(arr);
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+
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+//17.Object: real
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+// let user = {
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+// name: 'Ben',
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+// age: 17,
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+// login: 'login',
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+// password: 'pswd',
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+// device: {
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+// phone: 'Sumsung',
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+// laptop: 'Lenovo'
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+// }
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+// };
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+// console.log(user.device.phone);
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+
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+//18.Object: change
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+// let user = {
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+// name: 'Ben',
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+// age: 17,
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+// login: 'login',
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+// password: 'pswd',
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+// device: {
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+// phone: 'Sumsung',
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+// laptop: 'Lenovo'
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+// }
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+// };
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+// user['name'] = 'Kate';
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+// user.device.phone = 'iphone';
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+// console.log(user);
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+
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+//19.Comparison if
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+// var age = +prompt("Сколько вам лет?","");
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+// if (age < 0) {
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+// alert('Error');
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+// }
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+// else if (age <= 18){
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+// alert("школьник");
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+// }
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+// else if (age <= 30){
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+// alert("молодеж");
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+// }
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+// else if (age <= 45){
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+// alert("зрелость");
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+// }
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+// else if (age <= 60){
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+// alert("закат");
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+// }
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+// else if (age > 60){
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+// alert("как пенсия?");
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+// }
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+// else {
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+// alert("то ли киборг, то ли ошибка");
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+// };
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+
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+//20.Comparison: sizes, 21.Comparison: object
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+// let clothes = {
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+// outerwear: {
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+// russia : [40, 42, 44, 46, 48, 50, 52, 54],
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+// german : [34, 36, 38, 40, 43, 44, 46, 48],
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+// france : [36, 38, 40, 42, 44, 46, 48, 50],
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+// italy : [38, 40, 42, 44, 46, 48, 50, 52],
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+// gb : [8, 10, 12, 14, 16, 18, 20, 22],
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+// usa : ['S', 'M', 'M', 'L', 'L', 'XL', 'XL', 'XXL']
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+// },
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+// lingerie : {
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+// international : ['XXS', 'XS', 'S', 'M', 'L', 'XL', 'XXL', 'XXXL'],
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+// russia : [42, 44, 46, 48, 50, 52, 54, 56],
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+// german : [36, 38, 40, 42, 44, 46, 48, 50],
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+// usa : [8, 10, 12, 14, 16, 18, 20, 22],
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+// france : [38, 40, 42, 44, 46, 48, 50, 52],
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+// gb : [24, 26, 28, 30, 32, 34, 36, 38]
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+// },
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+// socks : {
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+// russia: [21, 22, 23, 24, 25, 26, 27],
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+// europe : [0, 1, 2, 3, 4, 5, 6],
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+// usa : [8, 8.5, 9, 9.5, 10, 10.5, 11]
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+// }
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+// };
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+// let wear = prompt('Which clothes do you need? Write your answer: outerwear/lingerie/socks', '');
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+// let size = +prompt('Which size do you want to change to different system?');
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+// let countryFrom = prompt('From which country system? russia/german/france/italy/gb/usa');
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+// let countryTo = prompt('To which country system? russia/german/france/italy/gb/usa');
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+
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+
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+// let index = clothes[wear][countryFrom].indexOf(size);
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+// let arrCountryTo = clothes[wear][countryTo];
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+// let sizeCountryTo = arrCountryTo[index];
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+// alert(`The size ${size} from ${countryFrom} system is ${sizeCountryTo} size in ${countryTo} system`);
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+
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+
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+//22.Ternary
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+// let qw = confirm('Are you a man?');
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+// qw ===true ? alert('You are a man') : alert('You are a woman');
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+
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+//23.Синий пояс Number: flats
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+// let floorsInEntrance = +prompt('Сколько этажей в подъезде?');
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+// let flatsOnFloor = +prompt('Сколько квартир на этаже?');
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+// let flat = +prompt('Номер квартиры?');
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+
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+// let flatsInEntrance = floorsInEntrance * flatsOnFloor;
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+// let entrance = Math.ceil(flat / flatsInEntrance);
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+// let x = flat - flatsInEntrance * (entrance - 1);
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+// let floor = Math.ceil(x / flatsOnFloor);
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+
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+// console.log(`Квартина # ${flat} находится в подъезде # ${entrance} на ${floor} этаже`);
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