Thread: Write a java program to verify given number is prime or not.

Hi. I am learning JAVA programming language. I want to write code for to check the weather given number is prime or not. I tried lots of method bit it will give error message. Please give me suitable code for that. Thank you.

Try this:

Code:

class Prime_number {
  public static void main(String[] args) {
    int num = 21;
    int i;
    for (i=2; i < num ;i++ ){
      int n = num%i;
      if (n==0){
        System.out.println("not Prime!");
        break;
      }
    }
    if(i == num){
      System.out.println("Prime number!");
    }
  }
}

**)
I have tried the given code but it didn’t solve my problem. Please try to provide some another solution.

So just have a look at the coding which can make you to understand more properly:

Code:

static public IsPrime(int number)
{
if (number == 1 || number == 2)
return 1;
for (int i=2; i<(int)(number/2); i{
if ( (number/i)==(int)(number/i) )
return 0;
}
return 1;
}