c语言的计算方法 (int)((double)9/2)-(9)%2式子结果为

(double)9/2 = 4.5
(int)((double)9/2) = 4
(9)%2 = 1 //都是整型
(int)((double)9/2)-(9)%2 = 4 - 1 = 3