Java program to display prime numbers from 1 to 100

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java program to display prime numbers from 1 to 100

Java program to display prime numbers from 1 to 100

Here’s the prime numbers from 1 to 100,

Also read – java program to check prime number

public class PrimeNumbersJava
{
public static void main(String[] args)
{
int a = 0;
int number = 0;
String strPrimeNumber = "";
for(a = 1; a <= 100; a++)
{
int counter = 0;
for(number = a; number >= 1; number--)
{
if(a % number == 0)
{
counter = counter + 1;
}
}
if(counter == 2)
{
strPrimeNumber = strPrimeNumber + a + " ";
}
}
System.out.println("Prime numbers from 1 to 100 : ");
System.out.println(strPrimeNumber);
}
}

Output:

Prime numbers from 1 to 100 : 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97

Similarly we can display from 1 to n,

import java.util.Scanner;

public class PrimeNumber
{
   public static void main(String[] args)
   {
      Scanner sc = new Scanner(System.in);
      int a = 0;
      int number = 0;
      String strPrimeNumber = "";
      System.out.println("Please enter the value of n : ");
      int n = sc.nextInt();
      for(a = 1; a <= n; a++)
      {
         int count = 0;
         for(number = a; number >= 1; number--)
         {
            if(a % number == 0)
            {
               count = count + 1;
            }
         }
         if(count == 2)
         {
            strPrimeNumber = strPrimeNumber + a + " ";
         }
      }
      System.out.println("Prime numbers from 1 to n : ");
      System.out.println(strPrimeNumber);
      sc.close();
   }
}

Output:

Please enter the value of n : 200
Prime numbers from 1 to n :
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97 101 103 107 109 113 127 131 137 139 149 151 157 163 167 173 179 181 191 193 197 199

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