Intro-CSharp-Book-v2015

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1062 Въведение в програмирането със C# } int n = int.Parse(input); return n; Тестване на решението След като всичко е готово, можем да пристъпим към проверка на решението. За целта можем да намерим например първите 25 прости числа и да проверим изхода на програмата за стойности на N от 1 до 5. Не трябва да пропускаме случая за N=1, тъй като това е граничен случай и вероятността за допусната грешка при него е значително по-голяма. В конкретния случай, при условие че сме тествали добре методите на всяка стъпка, можем да се ограничим с примерите от условието на задачата. Ето го изходът от програмата за стойности на N съответно 1, 2, 3 и 4: 2 2 3 5 7 2 3 5 7 11 13 17 19 23 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 Можем да се уверим, че решението на задачата работи сравнително бързо и за по-големи стойности на N. Например при N=200 не се усеща някакво забавяне. Следва пълната реализация на решението: using System; public class PrimesMatrix { static void Main() { int n = ReadInput(); PrintMatrix(n); } PrimesMatrix.cs private static int ReadInput() { Console.Write("N = "); string input = Console.ReadLine(); int n = int.Parse(input); return n; }
Глава 25. Практически изпит по програмиране (тема 2) 1063 private static bool IsPrime(int number) { if (number == 2) { return true; } if (number % 2 == 0) { return false; } } int maxDivider = (int)Math.Sqrt(number); for (int divider = 3; divider
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Съдържание Кратко
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Предговор Ако иска
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