Java实现1-2+3-4+5-6...+99

package test;

public class test2 {
    public static void main(String[] args) {
        int sum = 0;
        int count = 1;
        while (count < 100) {
            if (count % 2 == 0) {
                sum -= count;
            } else {
                sum += count;
            }
            count++;
        }
        System.out.println(sum);
    }

}