*计算1+2-3+4-5……+100*

package Day09; /*计算1+2-3+4-5……+100*/ public class Work02 { public static void main(String[] args) { int sum=1; for (int i = 2; i <=100; i++) { if(i%2==0){ sum+=i; }else{ sum-=i; } } System.out.println (sum); } }