how do i print prime and not prime number

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C#

how do i print prime and not prime number from 300 to 400 by using for loop and if statement.

Posted 12-Feb-13 16:48pm

andy007 2

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Guirec · Answer 1 · 2013-02-12T17:05:00

You take a paper, a pen and you write : 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397
:-)

more seriously here is a function to check if a number is a prime or not but beware you can only use it with relatively small numbers as it is not particularly optimized...

C#

public static bool IsPrime(this int number)
{
    return (Enumerable.Range(1,number).Where(x => number % x == 0).Count() == 2);
}

bapu_reddy · Answer 2 · 2013-02-12T17:08:00

Hello, this is logic to find out prime numbers between 300 to 400.

C#

namespace prime_number_series
{
    class Program
    {
        static void Main(string[] args)
        {
            for (int i = 300; i <= 400; i++)
            {
                int count1 = 0;
                int count2 = 0;
                for (int k = 301; k < i - 1; k++)
                {
                    int rem = i%k;
                    if (rem == 0)
                    {
                        count1++;
                    }
                    else
                    {
                        count2++;
                    }
                }
                if (count1 == 0)
                {
                    Console.Write("{0} \t",i);
                }

            }

            Console.ReadLine();
        }
    }

}

how do i print prime and not prime number

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