Question

How to find the prime numbers between 1 to 100 in C#

Answer 1

using System;
 
class Program
{
    static bool isPrime(int n) {
        if (n < 2 || (n % 2 == 0 && n != 2)) {
            return false;
        }
      
        int count = (int)Math.Floor(Math.Sqrt(n));
        for (int i = 3; i <= count; i += 2) {
            if (n % i == 0) {
                return false;
            }
        }
        return true;
    }
    static void Main() {
        for (int n = 2; n <= 100; n++) {
            if (isPrime(n)) {
                Console.Write(n + " ");
            }
        }
    }
}
 
 
 

 
/*
run:
 
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97 
 
*/

 

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