double x＝2.5,y＝2.7;int a＝7;printf("%.1f",x+a%3*(int)(x+y)%2/4);
显示a%3=2然后(int)(x+y)=5然后2 * 5 = 10然后10%2 = 0然后0/4 = 0然后x+0 = 2.5