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DeJohn Cromer
Prime Numbers
1 Answer(s)      5 years and 5 months ago
Posted in : Java Beginners

Create a complete Java program that allows the user to enter a positive integer n, and which then creates and populates an int array with the first n prime numbers. Your program should then display the contents of the array elements. You program should also ensure that the user enters a positive value for n, and should loop until they do so.

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November 7, 2011 at 12:24 PM

```import java.util.*;

class FindPrime{
static boolean isPrime(long number) {
boolean isPrime = false;
int i = (int) Math.ceil(Math.sqrt(number));
while (i > 1) {
if ((number != i) && (number % i == 0)) {
isPrime = false;
break;
} else if (!isPrime)
isPrime = true;
--i;
}
return isPrime;
}

public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter N: ");
long num = input.nextLong();

for (int i = 1; i < num; i++) {
if (isPrime(i)) {
System.out.println(i);
}
}
}
}
```

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