C#如何判断质数(转)

要求：重复让用户输入输入一个数，判断该数是否质数，当输入“q”时，程序运行结束！（质数的判断要求用方法来实现）。

class Program

{

static void Main(string[] args)

{

Console.WriteLine("请输入一个数：");

string numberString = Console.ReadLine();

while (numberString != "q")

{

int numberInt = Convert.ToInt32(numberString );

bool result = PanDuan (numberInt );

if (result == true)

Console.WriteLine("{0}是质数", numberInt);

else

Console.WriteLine("{0}不是质数",numberInt );

Console.WriteLine("请输入一个数：");

numberString = Console.ReadLine();

}

Console.WriteLine("操作结束！！！");

Console.ReadKey();

}

public static bool PanDuan(int number)

{

bool result=true;

for (int i = 2; i < number; i++)

{

if (number == 2)

{

result = true;

break;

}

else if (number % i == 0)

{

result = false;

break;

}

else

{

result = true;

break;

}

return result;

}

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