Program for printing 1 to n prime numbers using for loop in C#
In this tutorial, we will discuss the concept of the Program for printing 1 to n prime numbers using for loop in C#
In this post, we will learn how to print prime numbers between numbers of 1 to n using C# programming language using for loop with Example program.
Prime number
The number that can be divided by 1 and itself. it is called a prime number
for Example 2,3,5,7,11,13…
Print prime numbers between numbers 1 to n
Prime numbers between 1 to n using for- method 1
This program allows the user to enter a positive number for n then it will print prime numbers between numbers of 1 to n, using for loop in the C# language.
Program 1
using System;
namespace primeNumber
{
class first_N_Prime
{
static void Main(string[]args)
{
int i=1,num,count=0;
//variable declaration and initiation
Console.WriteLine("first n prime first number ");
Console.WriteLine("Enter the number");
num=int.Parse(Console.ReadLine());
//reading the input
for(int n=0; n<num; n++){
count=0;
for(int j=1; j<=i; j++){
if(i%j==0)
count++;
}
if(count==2){
Console.Write(i+",");
}
i++;
}
}
}
}
When the above code is executed, it produces the following result
first, n prime first number Enter the number 18 2,3,5,7,11,13,17,
Prime numbers between 1 to n using for- method 2
This program allows the user to enter a positive number for n then it will print prime numbers between numbers of 1 to n, using the C# language.
Program 2
using System;
namespace primeNumber
{
class first1toNPrime
{
static void Main(string[]args)
{
Console.WriteLine("print 1 to n prime number between 1 to n");
Console.WriteLine("Enter the number");
int num=int.Parse(Console.ReadLine());
//reading the input
bool isPrime=true;
for(var i=2; i<=num; i++){
for(var j=2; j<=num; j++)
{
if(i!=j && i%j==0){
isPrime=false;
break;
}
}
if(isPrime){
Console.Write(i+",");
}
isPrime=true;
}
Console.ReadKey();
}
}
}
When the above code is executed, it produces the following result
print 1 to n prime number between 1 to n Enter the number 20 2,3,5,7,11,13,17,19,
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