2. For operatori Do While operatori

2. do .. while tsikli

Do-while sikli while tsikliga o'xshaydi, faqat u tsiklning tanasini bajaradi. birinchi bo'lib, keyin tsiklni davom ettirish shartini tekshiradi. do-while sikli while siklining oʻzgarishidir. Uning sintaksisi:

do {

// sikl tanasi;

Bayonotlar);

} while (siklning davom etish sharti);

Uni amalga oshirishning blok diagrammasi 6.1-rasmda ko'rsatilgan.

Avval tsiklning tanasi bajariladi, so'ngra tsiklni davom ettirish sharti baholanadi. Agar baholash to'g'ri bo'lsa, tsiklning tanasi yana bajariladi; Agar u noto'g'ri bo'lsa, u holda do-while 6.1-rasm do-while sikli birinchi navbatda siklning tanasini bajaradi, so'ngra tsiklning davom etish shartini tekshirib, uni davom ettirish yoki to'xtatishni aniqlaydi. tsikl tugaydi. while siklining do-while siklidan farqi davom etish sharti baholanishi va sikl tanasining bajarilishi tartibidir. Siz siklni while yoki do-while siklidan foydalanib yozishingiz mumkin. Ba'zan boshqasidan ko'ra qulayroq tanlov mavjud. Masalan, Listing 6.2 da while tsiklini qayta yozishingiz mumkin. Listing 6.2 da ko'rsatilganidek, do-while siklidan foydalanish.

LISTING 6.1 TestDoWhile.java

1 import java.util.Scanner;

2

3 public class TestDoWhile {

4 /** Main method */

5 public static void main(String[] args) {

6 int data;

7 int sum = 0;

8

9 // Create a Scanner

10 Scanner input = new Scanner(System.in);

11

12 // Keep reading data until the input is 0

13 do {

14 // Read the next data

15 System.out.print(

16 "Enter an integer (the input ends if it is 0): ");

17 data = input.nextInt();

18

19 sum += data;

20 } while (data != 0);

21

22 System.out.println("The sum is " + sum);

23 }

24 }