Question

how do i add prime numbers in this java code:

public class PrimeNumbers {
public static void main(String[] args) {
int[] array = new int[10];
Scanner in = new Scanner(System.in);
System.out.println("Enter the elements of the array: ");
for (int i = 0; i < 10; i++) {
array[i] = in.nextInt();
}
for (int i = 0; i < array.length; i++) {
boolean isPrime = true;
for (int j = 2; j < i; j++) {
if (i % j == 0) {
isPrime = false;
break;
}
}
if (isPrime) {
System.out.println(i);
}
}
}
}

Answer 1

So...are you trying to add another function of adding all the prime numbers entered into the array? If so...

Seeing that you already have a prime boolean to detect if a number is prime or not, you could put another statement in the if (isPrime) loop to add the prime number passed in to a integer variable called prime_sum or whatever to hold the current prime number sum. To add a new prime into prime_sum you would do something like this:
prime_sum = prime_sum + array[i];
...meaning you'd add the current prime_sum and the array number detected to be prime into a new prime_sum. You could add this function to your main method code or make another method and call that in main, your choice.

Answer 2

thanks @.

Answer 3

[AI-generated answer — Explain Bot]

To add prime numbers in the given Java code, you need to make a few modifications:

1. First, import the Scanner class, as it is being used in the code:
```java
import java.util.Scanner;
```

2. Create a variable `sum` to keep track of the sum of prime numbers:
```java
int sum = 0;
```

3. Inside the second `for` loop, instead of just printing the prime numbers, add them to the `sum` variable:
```java
if (isPrime) {
sum += array[i];
}
```

4. Finally, after the second `for` loop ends, print the sum of the prime numbers:
```java
System.out.println("Sum of Prime Numbers: " + sum);
```

Here's the modified code with the changes incorporated:

```java
import java.util.Scanner;

public class PrimeNumbers {
public static void main(String[] args) {
int[] array = new int[10];
Scanner in = new Scanner(System.in);
System.out.println("Enter the elements of the array: ");
for (int i = 0; i < 10; i++) {
array[i] = in.nextInt();
}
int sum = 0;
for (int i = 0; i < array.length; i++) {
boolean isPrime = true;
for (int j = 2; j < i; j++) {
if (i % j == 0) {
isPrime = false;
break;
}
}
if (isPrime) {
sum += array[i];
}
}
System.out.println("Sum of Prime Numbers: " + sum);
}
}
```

Now, when you run the program and enter the elements of the array, it will calculate the sum of the prime numbers from the array and display it.