??? ?? 1? ? ??? ?? ??? ? ? ?? 1?? ? ?????. ?, ?? 'n'? 1 ?? 'n' ???? ???? ? ????. ? ??? ???? 2, 3, 5, 7, 9, 11, 13, 17, 19, 23 ?? ????. ?? ??? C# ????? ??? ?? ??? ??? ?? ? ??? ? ????. number? ???? ???? ????, ??? ?? ?? ?? ??? ?????. ?? for ??, if ??, if else ??, while ?? ?? ?? ??? ?? ? ???? ???? ??? ?????? C# ?????? ??? ? ????.

C# ??? ?

?? ????? ??? ?? ??? ???? ?????.

?? #1

1?? 100 ??? ?? ?? ??? ???? C# ????.

??:

using?System;
using?System.Collections.Generic;
using?System.Linq;
using?System.Text;
using?System.Threading.Tasks;
namespace?ConsoleApplication1
{
class?Program
{
static?void?Main(string[] args) // this function defines the entry point
{
bool?Prime = true;
Console.WriteLine("Prime Numbers between 1 to 100 : ");
for?(int?a = 2; a <= 100; a++) //upper limit and lower limit are defined
{
for?(int?b = 2; b <= 100; b++)// base logic for the primality
{
if?(a != b && a % b == 0) //modulo operators employed
{
Prime = false;
break;
}
}
if?(Prime)
{
Console.Write("\t"?+ a); //printing the correct variable
}
Prime = true;
}
Console.ReadKey(); //hold the output screen
}
}
}

??:

???? ??:?? ????? ??? ?? ???? ??? ???? ?? ??? ?? ???? ???? ???? ????. ?? ????? ???? ??? ?????. ?, 'a'? 2 ???? 99??? ??(?? ? ?? 1)? ???? ?????. ?? ????? ??? ??? ?? 'b'? ?????. ??? ??? ??? ????? ?? ?? 'a'?? ????. ?? ?? ??? ??? ???? ?? a? ?? b? ???? ???? ?? ??? ?????.

??? ???? a? b? ???? ????? 0? ?????. ?? b? ? ?? ????? ??? a? ???? ??? ?????. 0? ?? % b ?? ???? ?? ???? ?? ???? Prime? ?????. ?? ??? ??? ?? ?? ?? ???? ???? ?? ??? ??? ?????.

?? #2

for ??? ???? ?? ??

??:

using?System;
using?System.Collections.Generic;
using?System.Linq;
using?System.Text;
using?System.Threading.Tasks;
namespace?ConsoleApplication1
{
class?Program
{
public?static?void?Main(string[] args)
{
int?n, a, m = 0, PrimeIndicator = 0;
Console.Write("Please enter the number to check for Primality: ");
n = int.Parse(Console.ReadLine());
m = n / 2;
for?(a = 2; a <= m; a++)
{
if?(n % a == 0)
{
Console.Write("The entered number is not ?a Prime number .");
PrimeIndicator = 1;
break;
}
}
if?(PrimeIndicator == 0)
Console.Write("The entered number is a Prime number . ");
}
}
}

??:

???? ??:??? ??? ????? ?? ??? ???? ?? for ??? ?????. ?? ?? ??? ?? n? ???? ??? ??? ????, ???? ? 2?? n-1 ??? ?? ???? ??? ??? ????? ??? ???? ??? ?????. ????? n/2 ? ?? ??? ?? ??? ??? ??? ?? m? ????, ????? m ???? ??? ?? ?????.

?? #3

while ??? ??? ???.

??:

using?System;
using?System.Collections.Generic;
using?System.Linq;
using?System.Text;
using?System.Threading.Tasks;
namespace?ConsoleApplication1
{
class?Program
{
static?void?Main(string[] args)
{
int?n, i, a;
Console.Write("Enter any number: ");
n = Convert.ToInt32(Console.ReadLine()); // read the user input
a = 0;
i = 2;
while?(i <= n / 2)
{
if?(n % i == 0)
{
a = 1;
break;
}
i++;
}
if?(a == 0)
Console.WriteLine(n + " Prime Number as there are no factors");
else
Console.WriteLine(n + " not a Prime Number ");
Console.ReadLine();
}
}
}

??:

???? ??: ? ????? C#?? while ??? ???? ??? ???? ???? ??? ?????. ?? ????? ??? ?? ??? ???? ??? ??? ?? ?? 2?? ??? ?? ?? 2? ?? ??? ?? ???? ??? ???? ????? ? ???? ??? ?? ?????. ?? ??? ?? ???? a? ?? ?? ??? ?????.

??

??? ?? 1? ?? ???? ???? 1?? ? ??????. ???? ??? ??? ??? ? ???, ??? ??? ????? ???. ?? ??? ??? ????? do, for, while ??? ?? ??? ???? ??? ???? ???? ??? ?????. ?? ?? ????? ???? ??? ??? ???? ???? ??? ??? ?? ???? ??? ??? ?? ??? ?? ??? ???? ?????.

? ??? C#? ??? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!