Java实现1-2+3-4+5-6...+99

 1 package test;
 2 
 3 public class test2 {
 4     public static void main(String[] args) {
 5         int sum = 0;
 6         int count = 1;
 7         while (count < 100) {
 8             if (count % 2 == 0) {
 9                 sum -= count;
10             } else {
11                 sum += count;
12             }
13             count++;
14         }
15         System.out.println(sum);
16     }
17 
18 }