C#: Check whether a given number is prime or not
C# Sharp For Loop: Exercise-32 with Solution
Write a C# Sharp Program to determine whether a given number is prime or not.
Pictorial Presentation:

Sample Solution:
C# Sharp Code:
using System;
public class Exercise32
{
public static void Main()
{
int num,i,ctr=0;
Console.Write("\n\n");
Console.Write("Check whether a given number is prime or not:\n");
Console.Write("-----------------------------------------------");
Console.Write("\n\n");
Console.Write("Input a number: ");
num= Convert.ToInt32(Console.ReadLine());
for(i=2;i<=num/2;i++){
if(num % i==0){
ctr++;
break;
}
}
if(ctr==0 && num!= 1)
Console.Write("{0} is a prime number.\n",num);
else
Console.Write("{0} is not a prime number\n",num);
}
}
Sample Output:
Check whether a given number is prime or not: ----------------------------------------------- Input a number: 53 53 is a prime number.
Flowchart:

C# Sharp Code Editor:
Contribute your code and comments through Disqus.
Previous: Write a program in C to display the pattern like a diamond.
Next: Write a C# Sharp Program to display by Pascal's triangle
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
- Weekly Trends
- Java Basic Programming Exercises
- SQL Subqueries
- Adventureworks Database Exercises
- C# Sharp Basic Exercises
- SQL COUNT() with distinct
- JavaScript String Exercises
- JavaScript HTML Form Validation
- Java Collection Exercises
- SQL COUNT() function
- SQL Inner Join
- JavaScript functions Exercises
- Python Tutorial
- Python Array Exercises
- SQL Cross Join
- C# Sharp Array Exercises
We are closing our Disqus commenting system for some maintenanace issues. You may write to us at reach[at]yahoo[dot]com or visit us at Facebook