三目运算符: int a = 3; int b = 5; int max = a > b ? a : b;//a>b,输出a,a不大于b,输出b,相当于下面的if(){} else{} //int max = 0; //if (a > b) //{ // max = a; //} //else //{ // max = b; //} Console.WriteLine(max);