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Fix user input checking #2

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Fix user input checking #2

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313b98a
First practice - CheckCalculator
Apr 29, 2024
dbc3b04
Fixed user input checking, made CheckCalculator class fields private
Apr 29, 2024
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87 changes: 87 additions & 0 deletions src/main/java/CheckCalculator.java
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Original file line number Diff line number Diff line change
@@ -0,0 +1,87 @@
import java.util.ArrayList;
import java.util.HashMap;

public class CheckCalculator {

private int numPersons;
private double finalSum;
private HashMap<String,CheckItem> checkItems;
public CheckCalculator(int numPersons) {
this.numPersons = numPersons;
this.checkItems = new HashMap<>();
this.finalSum = 0;
}

public double calculate() {
if (numPersons < 2) {
System.out.println("Количество человек меньше 2");
return 0.0;
}
return finalSum / numPersons;
}
public double reCalculate() {
if (numPersons < 2) {
System.out.println("Количество человек меньше 2");
return 0.0;
}
double sum = 0;
for (CheckItem i: checkItems.values()) {
sum += i.calculateCost();
}
return sum / numPersons;
}

public void addCheckItem(String name, double price, int num) {
if (checkItems.containsKey(name)) {
CheckItem item = checkItems.get(name);
item.addNum(num);
checkItems.put(name,item);
} else {
checkItems.put(name, new CheckItem(name,price,num));
}

finalSum += price*num;
}

public void addCheckItem(String name, double price) {
addCheckItem(name,price,1);
}

public void printCheckItems() {
System.out.println("Добавленные товары:");
for (CheckItem i : this.checkItems.values()) {
System.out.println(i);
}
}
}

class CheckItem {
String name;
double price;
int num;

public CheckItem(String name, double price) {
this.name = name;
this.price = price;
this.num = 1;
}
public CheckItem(String name, double price, int num) {
this.name = name;
this.price = price;
this.num = num;
}

void addNum(int num) {
if (num > 0) {
this.num += num;
}
}
double calculateCost() {
return price*num;
}

@Override
public String toString() {
return String.format("%s %.2f * %d",name,price,num);
}
}
112 changes: 111 additions & 1 deletion src/main/java/Main.java
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Original file line number Diff line number Diff line change
@@ -1,6 +1,116 @@
import java.util.Scanner;

public class Main {
public static void main(String[] args) {
System.out.println("Hello world!");
Scanner input = new Scanner(System.in);
int numPersons = askNumPersons(input);

CheckCalculator calculator = new CheckCalculator(numPersons);
int numAdded = 0;
do {
String name = askName(input);
double price = askPrice(input);
calculator.addCheckItem(name,price);
System.out.println("Добавленные товары:\n"+name);
numAdded++;
} while (askContinue(input));

if (numAdded > 0) {
calculator.printCheckItems();
double sumPerOne = calculator.calculate();
rublesFormatter fmt = new rublesFormatter();
System.out.printf("%s с каждого человека\n", fmt.format(sumPerOne));
}
}

public static int askNumPersons(Scanner scanner) {
System.out.println("Введите количество человек (больше 1), между которыми разделить счет");
int num;
while (true) {
num = parsePositiveInt(scanner);
if (num <= 1) {
System.out.println("Неверное количество персон, введите число больше 1");
} else {
break;
}
}
return num;
}

public static String askName(Scanner scanner) {
System.out.println("Введите название блюда");
return scanner.next();
}

public static double askPrice(Scanner scanner) {
double price = 0.0;
while (true) {
System.out.println("Введите стоимость (руб.коп)");
price = parseDouble(scanner);
if (price < 0.0) {
System.out.println("Некорректное значение");
} else {
break;
}
}
return price;
}

public static boolean askContinue(Scanner scanner) {
System.out.println("Хотите что-то добавить? Напишите любой символ для продолжения, 'завершить' для выхода");
String input = scanner.next();
return !input.equalsIgnoreCase("завершить");
}

static int parsePositiveInt(Scanner scanner) {
String input = scanner.next().strip();
for (Character c: input.toCharArray()) {
if (!Character.isDigit(c)) {
return -1;
}
}
return Integer.parseInt(input);
}

static double parseDouble(Scanner scanner) {
String input = scanner.next().strip();
boolean haveDot = false;
for (Character c: input.toCharArray()) {
if (!Character.isDigit(c)) {
if (c.equals('.') && !haveDot) {
haveDot = true;
continue;
} else {
return -1.0;
}
}
}
return Double.parseDouble(input);
}

}

class rublesFormatter {
public String format(double num) {
return String.format("%.2f %s",num,numToRublesWord(Double.valueOf(num).intValue()));
}

public String numToRublesWord(int num) {
num = num % 100;
if ((num > 4) && (num < 20)) {
return "рублей";
} else {
num = num % 10;
switch (num) {
case 1:
return "рубль";
case 2:
case 3:
case 4:
return "рубля";
default:
return "рублей";
}
}
}
}