C# program to check whether a Number is Prime or Not
In this tutorial, we will discuss the concept of the C# program to check whether a Number is Prime or Not
In this post, we are going to learn how to check whether a number is prime or not in Csharp programming language with Example program
Prime number
The number that can be divided by 1 and itself ony. it is called a prime number
for Example 2,3,5,7,11,13…
Example to check whether a Number is Prime or Not
Check the prime number – variable initialization
In this program, we will initialize the variable as a positive number, then it will check whether the given number is a prime number or not, using the for loop in C# language.
Program 1
//c# program to check if a number is prime or not
using System;
public class CheckPriume{
public static void Main(string[] args)
{
int num=7,count=0;
for (int i=1; i<=num; i++){
if(num%i==0){
count++;
}
}
if(count==2){
Console.WriteLine ("{0} is a prime number",num);
}else{
Console.WriteLine ("{0} is noy a prime number",num);
}
}
}
When the above code is executed, it produces the following result
7 is a prime number
Check the prime number – Entered by the user
This program allows the user to enter a positive number then it will check whether the given number is a prime number or not, using the for loop in C# language.
Program 2
//c# program to check if a number is prime or not
//Entered by user
using System;
public class CheckPriume{
public static void Main(string[] args)
{
int num,count=0,i;
Console.WriteLine ("Enter the number to check prime or not");
num=int.Parse( Console.ReadLine());
int m=num/2;
for (i=2; i<=m; i++){
if(num%i==0){
Console.WriteLine ("{0} is not a prime number",num);
count=1;
break;
}
}
if(count==0){
Console.WriteLine ("{0} is a prime number",num);
}
}
}
When the above code is executed, it produces the following result
Case 1
Enter the number to check prime or not 17 17 is a prime number
Case 2
Enter the number to check prime or not 10 10 is not a prime number
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