Display prime numbers from 1 to 100 in java

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Display prime numbers from 1 to 100 in java

Here’s the prime numbers from 1 to 100,

Also read – prime number java

`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 + " are : ");      System.out.println(strPrimeNumber);      sc.close();   }}`

Output:

Please enter the value of n : 200
Prime numbers from 1 to 200 are :
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