用赋值表达式作为bool值

 enum Status
 {
     stOk,
     stQuit,
     stError
 };

 int main()
 {
     Status status;
     int n;
     bool b1 = (status = stOk);        //false
     bool b2 = (n = );                //false
     bool b3 = (n = );                //true
 }

总结：结果并非一直为true，得看后面赋的值是否为0