get prime number c#
// Assuming that the number passed is higher than 1.
// This function will check if the number is prime by using all the previous
// numbers. There's no need to check further than the square root
// Returns true or false.
public static bool isPrime(int number)
{
double sqrNum = Math.Sqrt(number);
for (int i = 2; i <= sqrNum; i++) if (number % i == 0) return false;
return true;
}
// This function is essentially the same
// but will only compare with numbers from a prime number list
public static bool isPrime(int number, int[] primeList)
{
double sqrNum = Math.Sqrt(number);
foreach(int prime in primeList) {
if (prime > sqrNum) return true;
else if (number % prime==0) return false;
}
return true;
}
// You can expand your primeList using any of the functions,
//to better use the second function.
4
2
static Boolean PrimerNumber (int x) //The function return a value of true or false for a prime number
{
int i, count=0;
bool flag=false;
for (i = 2; i < x; i++)
{
if (x % i == 0)
{
cont = 1;
break;
}
}
if (count == 0)
flag = true;
return flag;
}
Thank you!
2
4
(2 Votes)
0
4.5
8
using System;
public class PrimeNumberExample
{
public static void Main(string[] args)
{
int n, i, m=0, flag=0;
Console.Write("Enter the Number to check Prime: ");
n = int.Parse(Console.ReadLine());
m=n/2;
for(i = 2; i <= m; i++)
{
if(n % i == 0)
{
Console.Write("Number is not Prime.");
flag=1;
break;
}
}
if (flag==0)
Console.Write("Number is Prime.");
}
}
Thank you!
8
4.5
(8 Votes)
0
0
1
using System;
namespace Demo {
class MyApplication {
public static void Main() {
int n = 5, a = 0;
for (int i = 1; i <= n; i++) {
if (n % i == 0) {
a++;
}
}
if (a == 2) {
Console.WriteLine("{0} is a Prime Number", n);
} else {
Console.WriteLine("Not a Prime Number");
}
Console.ReadLine();
}
}
}
Thank you!
1
0
0
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