Intro-CSharp-Book-v2015

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406 Въведение в програмирането със C# System.Random и неговия метод Next(). Преди да използваме класа Random трябва да създадем негова инстанция, при което тя се инициализира със случайна стойност (извлечена от текущото системно време в операционната система). След това можем да генерираме случайно число в интервала [0…n) чрез извикване на метода Next(n). Забележете, че този метод може да върне нула, но връща винаги случайно число по-малко от зададената стойност n. Затова, ако искаме да получим число в интервала [1…49], трябва да използваме израза Next(49) + 1. Следва примерен изходен код на програма, която, използвайки класа Random, генерира 6 случайни числа в интервала от 1 до 49: class RandomNumbersBetween1And49 { static void Main() { Random rand = new Random(); for (int number = 1; number
Глава 11. Създаване и използване на обекти 407 6. До момента паролата трябва да се състои от 8 знака. За да я допълним до най-много 15 символа, можем случаен брой пъти (между 0 и 7) да вмъкнем на случайна позиция в паролата случаен знак (главна буква или малка буква, или цифра или специален символ). Следва имплементация на описания алгоритъм: class RandomPasswordGenerator { private const string CapitalLetters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; private const string SmallLetters = "abcdefghijklmnopqrstuvwxyz"; private const string Digits = "0123456789"; private const string SpecialChars = "~!@#$%^&*()_+=`{}[]\\|':;.,/?"; private const string AllChars = CapitalLetters + SmallLetters + Digits + SpecialChars; private static Random rnd = new Random(); static void Main() { StringBuilder password = new StringBuilder(); // Generate two random capital letters for (int i = 1; i
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Книга "Въведение в
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Въведение в програ
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Съдържание Кратко
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Съдържание 13 Конст
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Съдържание 15 Изпол
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Съдържание 17 Прави
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Предговор Ако иска
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Предговор 21 Ако все
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Заключение Ако сте
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