C# dasturlash tilida fayllar bilan ishlash

Switch operatorida default amalini yozish shart emas, chunki u berilgan qiymatning tanlangan birorta qiymatga mos kelmaganda bajariladigan amallarni o’z ichiga oladi. Agarda berilgan qiymat birorta tanlangan qiymatga mos kelsa, u holda case amalidan keyin bajariladigan amallar (ular bir nechta bo’lsa, { } orasiga olinadi) bajariladi, so’ng break amali switch operatorining ishini shu joyda to’xtatadi va switch operatoridan keyin keladigan operator ishini davom ettiradi.
C va C++ tillarida keyingi case amaliga avtomatik o’tishingiz mumkin, agarda oldingi case amalining oxirida break yoki goto operatorlari yozilmagan bo’lsa. Shunday qilib, C va C++ da quyidagicha yozish mumkin :
Case : statement 1 ; Case : statement 2; Break ;
Bu misolda statement 1 dan so’ng statement 2 ga avtomatik tarzda o’tiladi (C++ da). C# da bu dastur ishlamaydi, chunki C# tili sintaksisida case1 dan case2 ga ikki xil vaziyatda o’tish mumkin : agarda birinchi amal bo’sh bo’lsa (case dan so’ng hech qanday qiymat tekshiriladi) yoki break, goto operatorlari yordamida. Har bir case operatori o’zida break amalini ushlab turishi lozim. Masalan:
{


switch (a ) case 10:
Console.WriteLine("a= 10" ) ; break;
case 20: Console.WriteLine("a=20"); break;
case 30: Console.WriteLine("a= 30"); break;
}

yoki quyidagicha berish ham mumkin :

using System; namespace Misol class MyClass
static void Main(string[j] args)


{


int user = 0;


user = Convert.Tolnt32(Console.ReadLine( )); switch(user)
case 0:


Console.WriteLine("Salom User1"); break;
case 1 :


Console.WriteLine("Salom User2"); break;
case 2:


Console.WriteLine("Salom User3"); break;
default:


Console.WriteLine("Salom yangi foydalanuvchi"); break;
}

Quyida iqtisodiy masalani yechish usuli berilgan :

using System;


namespace C_Sharp_Programing


{


class Part


{


public static void Main()
{


Console.WriteLine("1: mahsulot nomini kiriting,n2: mahsulot sonini kiriting"); int Choice = Convert.Tolnt32(Console.ReadLine());
switch (Choice) case 1 :
string Kane;


Console.Write("Mahsulot nomini kiriting " ) ; Name = Console.ReadLine();
break; case 2:
int Count;


Console.Write("Mahsulot sonini kiriting " ) ; Name = Console.ReadLine();
Count = Convert.Tolnt32(Console.ReadLine()) ; break;
default:


break;}