测试markdown效果

    #include <stdio.h>
    #include <math.h>
    int main() {
        int n, t;
        scanf("%d", &t);
        while (t-- && (scanf("%d", &n)) {
            printf("%.0f\n", pow(2, n) + 2);
        }
        return 0;
    }

public class LoopTest {
    public static void main(String[] args) {
        int sum = 0;
        for (int i = 0; i < 100; i += 2) {
            sum += i;
        }
        System.out.println("sum = " + sum);
    }
}

public class Test {
    public static void main(String[] args) {
        System.out.println("Hello World");
    }
}