Prime number is a number that is greater than 1 and divided by 1 or itself. In other words, prime numbers can't be divided by other numbers than itself or 1. For example 2, 3, 5, 7, 11, 13, 17, 19, 23.... are the prime numbers.
Let's see the prime number program in C#. In this C# program, we will take an input from the user and check whether the number is prime or not.
If you don't know what is prime number please read form this tutorial. Prime Number & Prime Factors
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.");
}
}
output 1:
Enter the Number to check Prime: 17
Number is Prime.
Output 2:
Enter the Number to check Prime: 57
Number is not Prime.
First understand the algorithm carefully. Then study the program line-by-line and compare it with the output. Finally, review the explanation section to strengthen your logic and programming understanding.
Rewrite the program without looking at the code. Modify values, conditions or logic and run it again. This helps improve confidence and strengthens coding skills much faster.