题解 | #KiKi求质数个数#

public class Main {
    
    public static void main(String[] args) {
        
        int[] arr = new int[900];
        boolean isLing = false;
        int index = 0;
        for(int i = 100 ; i <= 999 ; i++) {
            for(int j = 2 ; j < i ; j++) {
                if(i % j == 0) {
                    isLing = true;
                    break;
                } else {
                    isLing = false;
                }
            }
            if(!isLing) {
                arr[index++] = i;
            }
        }
        int count = 0;
        for(int i = 0 ; i < 900 ; i++) {
            if(arr[i] != 0) {
                count++;
                // System.out.print(arr[i] + " ");
            }
        }
        System.out.println(count);
    }
}