calc.java

import java.util.Scanner;

public class calc {
    static void plus() {
        Scanner scan = new Scanner(System.in);
        int number, result = 0, i = 1;
        System.out.println("durmak icin 0 a basin!!");
        while (true) {
            System.out.print(i++ + ". sayi :");
            number = scan.nextInt();
            if (number == 0) {
                break;
            }
            result += number;
        }
        System.out.println("Sonuc : " + result);
        scan.close();
    }

    static void minus() {
        Scanner scan = new Scanner(System.in);
        System.out.print("Kac adet sayi gireceksiniz :");
        int counter = scan.nextInt();
        int number, result = 0;

        for (int i = 1; i <= counter; i++) {
            System.out.print(i + ". sayi :");
            number = scan.nextInt();
            if (i == 1) {
                result += number;
                continue;
            }
            result -= number;
        }

        System.out.println("Sonuc : " + result);
        scan.close();
    }

    static void times() {
        Scanner scan = new Scanner(System.in);
        int number, result = 1, i = 1;

        while (true) {
            System.out.print(i++ + ". sayi :");
            number = scan.nextInt();

            if (number == 1)
                break;

            if (number == 0) {
                result = 0;
                break;
            }
            result *= number;
        }

        System.out.println("Sonuc : " + result);
        scan.close();
    }

    static void divided() {
        Scanner scan = new Scanner(System.in);
        System.out.print("Kac adet sayi gireceksiniz :");
        int counter = scan.nextInt();
        double number, result = 0.0;

        for (int i = 1; i <= counter; i++) {
            System.out.print(i + ". sayi :");
            number = scan.nextDouble();
            if (i != 1 && number == 0) {
                System.out.println("Boleni 0 giremezsiniz.");
                continue;
            }
            if (i == 1) {
                result = number;
                continue;
            }
            result /= number;
        }

        System.out.println("Sonuc : " + result);
        scan.close();
    }

    static void power() {
        Scanner scan = new Scanner(System.in);
        System.out.print("Taban degeri giriniz :");
        int base = scan.nextInt();
        System.out.print("Us degeri giriniz :");
        int exponent = scan.nextInt();
        int result = 1;

        for (int i = 1; i <= exponent; i++) {
            result *= base;
        }

        System.out.println("Sonuc : " + result);
        scan.close();
    }

    static void factorial() {
        Scanner scan = new Scanner(System.in);
        System.out.print("Sayi giriniz :");
        int n = scan.nextInt();
        int result = 1;

        for (int i = 1; i <= n; i++) {
            result *= i;
        }

        System.out.println("Sonuc : " + result);
        scan.close();
    }

    static void mod(){
        int result;
        Scanner inp = new Scanner(System.in);
        int a,b;
        System.out.println("Sayilari giriniz(a mod b):");
        a=inp.nextInt();
        System.out.println("mod");
        b= inp.nextInt();
        result = a%b;
        System.out.println("sonuc= " + result);
        inp.close();
    }

    static void rectangle(){
        int uzunKenar,kisaKenar;
        double alan,cevre;
        Scanner inp = new Scanner(System.in);
        System.out.println("uzun kenar uzunlugu:");
        uzunKenar = inp.nextInt();
        System.out.println("kisa kenar uzunlugu:");
        kisaKenar = inp.nextInt();

        alan = uzunKenar*kisaKenar;
        cevre = 2*(uzunKenar+kisaKenar);

        System.out.println("Dikdortgenin alani = "+alan);
        System.out.println("Dikdortgenin cevresi = "+cevre);
        inp.close();
    }

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int select;
        String menu = "1- Toplama Islemi\n"
                + "2- Cikarma Islemi\n"
                + "3- Carpma Islemi\n"
                + "4- Bolme islemi\n"
                + "5- Uslu Sayi Hesaplama\n"
                + "6- Faktoriyel Hesaplama\n"
                + "7- Mod Alma\n"
                + "8- Dikdortgen Alan ve Cevre Hesabi\n"
                + "0- Cikis Yap";

        do {
            System.out.println(menu);
            System.out.print("Lutfen bir islem seciniz :");
            select = scan.nextInt();
            switch (select) {
                case 1:
                    plus();
                    break;
                case 2:
                    minus();
                    break;
                case 3:
                    times();
                    break;
                case 4:
                    divided();
                    break;
                case 5:
                    power();
                    break;
                case 6:
                    factorial();
                    break;
                case 7:
                    mod();
                    break;
                case 8:
                    rectangle();
                    break;
                case 0:
                    break;
                default:
                    System.out.println("Yanlis bir deger girdiniz, tekrar deneyiniz.");
            }
        } while (select != 0);

        scan.close();
    }
}