质数

public class TestZhiShu {
    public static void main(String[] args) {
        int num = 0;
        for (int i = 2; i <= 100; i++) {
            boolean isExists = false;
            for (int j = 2; j < (i / 2 + 1); j++) {
                num++;
                if (i % j == 0) {
                    isExists = true;
                    break;
                }
            }
            if (!isExists) {
                System.out.print(i + " ");
            }
        }
        System.out.println("num = " + num);

    }
}

public class TestHeShu {
    public static void main(String[] args) {
        for (int i = 2; i < 100; i++) {
            boolean isHeShu = false;
            for (int j = 2; j < i; j++) {
                if (i % j == 0) {
                    isHeShu = true;
                    break;
                }
            }
            if (isHeShu) {
                System.out.print(i + " ");
            }
        }
    }
}