fartita · Mar 31, 2024 · Mar 31, 2024 · Apr 1, 2024 · Apr 2, 2024
diff --git a/src/main/java/Calculator.java b/src/main/java/Calculator.java
@@ -0,0 +1,41 @@
+import java.util.ArrayList;
+
+public class Calculator {
+    ArrayList<Pair<String, Double>> listItems = new ArrayList<Pair<String, Double>>();
+
+    public void printResult(int guests){
+        Double allPrice = 0.0;
+        System.out.println("Добавленные товары:\n");
+        for(int i = 0; i < listItems.size(); i++){
+            System.out.printf("%s, стоит %.2f %s\n",listItems.get(i).getLeft(), listItems.get(i).getRight(), printRoubles(listItems.get(i).getRight()));
+            allPrice = listItems.get(i).getRight() + allPrice;
+        }
+        Double sumPerPerson = allPrice/guests;
+        String roubles = printRoubles(sumPerPerson);
+        System.out.printf("Каждый заплатит %.2f %s", sumPerPerson, roubles);
+    }
+
+    private String printRoubles(Double dChislo){
+        String rouble;
+        String chislo = String.format("%.2f", dChislo).split(",")[0];
+        if(chislo.length() > 1){
+            if(chislo.charAt(chislo.length()-2) == '1'){
+                return "рублей";
+            }
+        }
+        switch(chislo.charAt(chislo.length()-1)){
+            case '1':
+                rouble = "рубль";
+                break;
+            case '2':
+            case '3':
+            case '4':
+                rouble = "рубля";
+                break;
+            default:
+                rouble = "рублей";
+                break;
+        }
+        return rouble;
+    }
+}
diff --git a/src/main/java/Main.java b/src/main/java/Main.java
@@ -1,6 +1,69 @@
+import java.util.Scanner;
 
 public class Main {
     public static void main(String[] args) {
-        System.out.println("Hello world!");
+
+        Scanner scanner = new Scanner(System.in);
+
+        int guests = getGuests(scanner);
+        Calculator calc = new Calculator();
+        while(true){
+            System.out.println("Введите товар");
+            String name = scanner.next();
+            System.out.println("Введите стоимость, цену введите дробную с точкой");
+            scanner.nextLine();
+            Double cost  = insertDouble(scanner);
+            calc.listItems.add(new Pair(name, cost));
+            System.out.println("Товар успешно добавлен, завершить подсчет?");
+            String answer = scanner.next();
+            if(answer.toLowerCase().contains("завершить")){
+                break;
+            }
+        }
+        calc.printResult(guests);
+        scanner.close();
+    }
+
+    public static int getGuests(Scanner scanner){
+        int count;
+        while(true){
+            System.out.println("Сколько гостей?");
+            count = insertCount(scanner);
+            if(count <= 1){
+                System.out.println("Некорректное значение для подсчета");
+            }
+            else{
+                break;
+            }
+        }
+        return count;
+    }
+
+    public static int insertCount(Scanner scanner){
+        int count;
+        try{
+                count = Integer.parseInt(scanner.nextLine());
+        }
+        catch (Exception e){
+                System.out.println("Введите целочисленное");
+                count = insertCount(scanner);
+        }
+        return count;
+    }
+
+    public static Double insertDouble(Scanner scanner){
+        double count;
+        try{
+
+            count = Double.parseDouble(scanner.nextLine());
+            if(count < 0){
+                throw new Exception("Negative Double");
+            }
+        }
+        catch (Exception e){
+                System.out.println("Введите положительное дробное число с точкой");
+                count = insertDouble(scanner);
+        }
+        return count;
     }
 }
diff --git a/src/main/java/Pair.java b/src/main/java/Pair.java
@@ -0,0 +1,28 @@
+public class Pair<L,R> {
+
+        private final L left;
+        private final R right;
+
+        public Pair(L left, R right) {
+            assert left != null;
+            assert right != null;
+
+            this.left = left;
+            this.right = right;
+        }
+
+        public L getLeft() { return left; }
+        public R getRight() { return right; }
+
+        @Override
+        public int hashCode() { return left.hashCode() ^ right.hashCode(); }
+
+        @Override
+        public boolean equals(Object o) {
+            if (!(o instanceof Pair)) return false;
+            Pair pairo = (Pair) o;
+            return this.left.equals(pairo.getLeft()) &&
+                    this.right.equals(pairo.getRight());
+        }
+}
+