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Lesson 02 #1

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55 changes: 55 additions & 0 deletions src/main/java/lessons/lesson02/Main.java
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package lessons.lesson02;

import java.util.Scanner;

public class Main {
public static void main(String[] args) {
// Problems first = new Problems();
// first.first();
//
// Problems second = new Problems();
// second.second();
//
// Problems third = new Problems();
// third.third();
//
// Problems fourth = new Problems();
// fourth.fourth();

// Problems five = new Problems();
// five.fifth();
//
// Problems six = new Problems();
// six.sixth_reverse();

// Problems eight = new Problems();
// eight.eighth();
//
// Problems nine = new Problems();
// nine.ninth_simpleNumbers();

// Problems2 changer = new Problems2();
// changer.changeValue();

// Problems2 tableOfMult = new Problems2();
// tableOfMult.tableOfMultiplications();

// Problems2 currency = new Problems2();
// currency.converterOfCurrency();

// Problems2 number = new Problems2();
// number.evenOrOdd();

// Problems2 bigger = new Problems2();
// bigger.checkBigger();

// Problems2 cal = new Problems2();
// cal.calculator();

// Problems2 average = new Problems2();
// average.average();

Problems2 search = new Problems2();
search.search();
}
}
97 changes: 97 additions & 0 deletions src/main/java/lessons/lesson02/Problems.java
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package lessons.lesson02;

import java.util.Scanner;

public class Problems {

void first() { // oneToHundread
for (int i = 1; i <= 100; i++) {
System.out.print(i + " ");
if (i % 10 == 0) {
System.out.println();
}
}
System.out.println();
}


void second() { // sum_oneTo_N
Scanner inputNumber = new Scanner(System.in);
System.out.println("Input a number: ");
int number = inputNumber.nextInt();
int res = 0;
for (int i = 1; i <= number; i++) {
res += i;
}
System.out.println(res + "\n");
}

void third() { // multiply_one_to_N
Scanner input = new Scanner(System.in);
System.out.println("Input a number: ");
int number = input.nextInt();
int res = 1;
for (int i = 1; i <= number; i++) {
res *= i;
}
System.out.println(res + "\n");
}

void fourth() { // sumOfEvenNumbers
Scanner input = new Scanner(System.in);
System.out.println("Input a number: ");
int number = input.nextInt();
int res = 0;
for (int i = 1; i <= number; i++) {
if (i % 2 == 0) {
res += i;
}
}
System.out.println(res + "\n");
}

void fifth() { // Sum of String numbers
Scanner input = new Scanner(System.in);
System.out.println("Input a number: ");
int number = input.nextInt();
int res = 0;
while (number > 0) {
res += number % 10;
number = number / 10;
}
System.out.println(res + "\n");
}

void sixth_reverse() { // reversing number
Scanner input = new Scanner(System.in);
System.out.println("Input a number: ");
int reverse = 0;
int number = input.nextInt();
while (number > 0) {
reverse = reverse * 10 + number % 10;
number = number / 10;
}
System.out.println(reverse + "\n");
}


void eighth() { // finds a number divisible by 7 and bigger than 1000
for (int number = 1000; number < Integer.MAX_VALUE; number++) {
if (number % 7 == 0) {
System.out.println(number);
break;
}
}
}

void ninth_simpleNumbers() { // Shows only simple numbers
Scanner input = new Scanner(System.in);
System.out.println("Input a number: ");
int number = input.nextInt();
for (int i = 0; i <= number; i++) {
if (i % 2 != 0) {
System.out.println(i);
}
}
}
}
151 changes: 151 additions & 0 deletions src/main/java/lessons/lesson02/Problems2.java
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package lessons.lesson02;

import java.util.Random;

public class Problems2 {


void changeValue() {
System.out.println("Input two values: ");
int num1 = Utils.input.nextInt();
int num2 = Utils.input.nextInt();
System.out.println(num2 + " " + num1);
}

void tableOfMultiplications() {
System.out.println("Choose operation: \n1:Table of multiplication\n2: The specific raw");
int numOfoper = Utils.input.nextInt();

if (numOfoper == 1) {
for (int i = 1; i <= 9; i++) {
for (int j = 1; j <= 9; j++) {
int res = i * j;
System.out.print(j + " * " + i + " = " + res + "\t");
}
System.out.println();
}
} else if (numOfoper == 2) {
System.out.println("Input a number to see a raw of table: ");
int num = Utils.input.nextInt();
for (int i = 1, j = num; i <= 9; i++) {
int res = j * i;
System.out.println(j + " * " + i + " = " + res);
}
}
}

void converterOfCurrency() {
int exchange = 12500;
System.out.println("Input the value in $ to convert into UZD: ");
double value = Utils.input.nextDouble();
System.out.println(exchange * value);
}

void evenOrOdd() {
System.out.println("Input a number to check: ");
int number = Utils.input.nextInt();
if (number % 2 == 0) {
System.out.println(number + " is even");
} else {
System.out.println(number + " is odd");
}
}

void checkBigger() {
System.out.println("Print a three number by enter: ");

int num1 = Utils.input.nextInt();
int num2 = Utils.input.nextInt();
int num3 = Utils.input.nextInt();

if (num1 > num2 && num1 > num3) {
System.out.println("The biggest number is: " + num1);
} else if (num2 > num1 && num2 > num3) {
System.out.println("The biggest number is: " + num2);
} else {
System.out.println("The biggest number is: " + num3);
}
}

void calculator() {
System.out.println("Input first number: ");
double num1 = Utils.input.nextDouble();

System.out.println("Input second number: ");
double num2 = Utils.input.nextDouble();

System.out.println("Input an operation with numbers: (+, -, *, /, %)");
String operation = Utils.input.next();

switch (operation) {
case "+":
System.out.println(num1 + num2);
break;
case "-":
System.out.println(num1 - num2);
break;
case "*":
System.out.println(num1 * num2);
break;
case "/":
System.out.println(num1 / num2);
break;
case "%":
System.out.println(num1 % num2);
break;
default:
System.out.println("Unknown operation! Try again.");
}
}

void average() {
System.out.print("How many numbers do yo want to write: ");
int n = Utils.input.nextInt();
System.out.print("Print them: ");
int[] numbers = new int[n];
int avr = 0;
for (int i = 0; i < n; i++) {
numbers[i] = Utils.input.nextInt();
}
for (int number : numbers) {
avr += number;
}
System.out.println("Average: " + avr);
}

void search() {
System.out.print("How many numbers do you want write: ");
int n = Utils.input.nextInt();
System.out.print("Print an array of numbers: ");
int[] numbers = new int[n];
for (int i = 0; i < n; i++) {
numbers[i] = Utils.input.nextInt();
}
System.out.print("Input a number to search it in the array: ");
int search = Utils.input.nextInt();
boolean found = false;
for (int number : numbers) {
if (search == number) {
found = true;
break;
}
}
if (found) {
System.out.println("The number is found in the array!");
} else {
System.out.println("No such number! Try again.");
}
}

void random1() {
Random random = new Random();
int number = random.nextInt(100);
System.out.println("You have 3 chances to guess right number\nFirst: ");
int try1 = Utils.input.nextInt();
int try2 = Utils.input.nextInt();
int try3 = Utils.input.nextInt();
if (number == try1) {
System.out.println("Found!");
}
}
}
7 changes: 7 additions & 0 deletions src/main/java/lessons/lesson02/Utils.java
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package lessons.lesson02;

import java.util.Scanner;

public class Utils {
public static final Scanner input = new Scanner(System.in);
}