C# — Из-за чего нестабильный «Random»?

#c_sharp #случайные_числа

Возникла проблема с функцией "Random". Иногда не выводит результат. Суть: Я сделал
"рандомное" число от 1 до 100, и далее прописал с помощью "if" что будет происходить,
если выпадут определенные числа. И при тестировании, иногда не выводился результат,
я решил проверить, написал: else { Console.WriteLine("Error") }. В итоге с достаточно
неплохим шансом выдает Error... В чём проблема? Вот код:

Random rnd1 = new Random();
if (rnd1.Next(0, 100) == 1 || rnd1.Next(1, 100) == 2 || rnd1.Next(1, 100) == 3 ||
rnd1.Next(1, 100) == 4 || rnd1.Next(1, 100) == 5 || rnd1.Next(1, 100) == 6 || rnd1.Next(1,
100) == 7 || rnd1.Next(1, 100) == 8 || rnd1.Next(1, 100) == 9 || rnd1.Next(1, 100)
== 10 || rnd1.Next(1, 100) == 11 || rnd1.Next(1, 100) == 12 || rnd1.Next(1, 100) ==
13 || rnd1.Next(1, 100) == 14 || rnd1.Next(1, 100) == 15 || rnd1.Next(1, 100) == 16
|| rnd1.Next(1, 100) == 17 || rnd1.Next(1, 100) == 18 || rnd1.Next(1, 100) == 19 ||
rnd1.Next(1, 100) == 20 || rnd1.Next(1, 100) == 21 || rnd1.Next(1, 100) == 22 || rnd1.Next(1,
100) == 23 || rnd1.Next(1, 100) == 24 || rnd1.Next(1, 100) == 25 || rnd1.Next(1, 100)
== 26 || rnd1.Next(1, 100) == 27 || rnd1.Next(1, 100) == 28 || rnd1.Next(1, 100) ==
29 || rnd1.Next(1, 100) == 30 || rnd1.Next(1, 100) == 31 || rnd1.Next(1, 100) == 32
|| rnd1.Next(1, 100) == 33 || rnd1.Next(1, 100) == 34 || rnd1.Next(1, 100) == 35)
{
    Console.WriteLine("1");
}
else if (rnd1.Next(0, 100) == 36 || rnd1.Next(1, 100) == 37 || rnd1.Next(1, 100)
== 38 || rnd1.Next(1, 100) == 39 || rnd1.Next(1, 100) == 40 || rnd1.Next(1, 100) ==
41 || rnd1.Next(1, 100) == 42 || rnd1.Next(1, 100) == 43 || rnd1.Next(1, 100) == 44
|| rnd1.Next(1, 100) == 45 || rnd1.Next(1, 100) == 46 || rnd1.Next(1, 100) == 47 ||
rnd1.Next(1, 100) == 48 || rnd1.Next(1, 100) == 49 || rnd1.Next(1, 100) == 50 || rnd1.Next(1,
100) == 51 || rnd1.Next(1, 100) == 52 || rnd1.Next(1, 100) == 53 || rnd1.Next(1, 100)
== 54 || rnd1.Next(1, 100) == 55 || rnd1.Next(1, 100) == 56 || rnd1.Next(1, 100) ==
57 || rnd1.Next(1, 100) == 58 || rnd1.Next(1, 100) == 59 || rnd1.Next(1, 100) == 60
|| rnd1.Next(1, 100) == 61 || rnd1.Next(1, 100) == 62 || rnd1.Next(1, 100) == 63 ||
rnd1.Next(1, 100) == 64 || rnd1.Next(1, 100) == 65)
{
    Console.WriteLine("2");
}
else if (rnd1.Next(0, 100) == 66 || rnd1.Next(1, 100) == 67 || rnd1.Next(1, 100)
== 68 || rnd1.Next(1, 100) == 69 || rnd1.Next(1, 100) == 70 || rnd1.Next(1, 100) ==
71 || rnd1.Next(1, 100) == 72 || rnd1.Next(1, 100) == 73 || rnd1.Next(1, 100) == 74
|| rnd1.Next(1, 100) == 75 || rnd1.Next(1, 100) == 76 || rnd1.Next(1, 100) == 77 ||
rnd1.Next(1, 100) == 78 || rnd1.Next(1, 100) == 79 || rnd1.Next(1, 100) == 80 || rnd1.Next(1,
100) == 81 || rnd1.Next(1, 100) == 82 || rnd1.Next(1, 100) == 83 || rnd1.Next(1, 100)
== 84 || rnd1.Next(1, 100) == 85)
{
    Console.WriteLine("3");
}
else if (rnd1.Next(0, 100) == 86 || rnd1.Next(0, 100) == 87 || rnd1.Next(0, 100)
== 88 || rnd1.Next(0, 100) == 89 || rnd1.Next(0, 100) == 90 || rnd1.Next(0, 100) ==
91 || rnd1.Next(0, 100) == 92 || rnd1.Next(0, 100) == 93 || rnd1.Next(0, 100) == 94
|| rnd1.Next(0, 100) == 95 || rnd1.Next(0, 100) == 96 || rnd1.Next(0, 100) == 97 ||
rnd1.Next(0, 100) == 98 || rnd1.Next(0, 100) == 99 || rnd1.Next(0, 100) == 100)
{
    Console.WriteLine("4");
}
else
{
    Console.WriteLine("Error");
}
string theEnd = Console.ReadLine();

    

Ответы

Ответ 1

(Не будем хаять невинный Random.)

Вы все время сравниваете с константами разные числа.

Random rnd1 = new Random();
int value = rnd1.Next(0, 100);

if (value >= 1 && value <= 35) 
{
  Console.WriteLine("1");
}
else if (...


И почему у Вас в некоторых вызовах Next нижняя граница 0, а в некоторых 1?

Надо

int value = rnd1.Next(0, 100) + 1;


или

int value = rnd1.Next(1, 101);