~~~ //異常的基類 class Father { public: virtual void printM() { } }; //1.有繼承 class SonNULL : public Father { public: virtual void printM()//2.重寫父類的虛函數 { cout << "空指針異常" << endl; } }; class SonOut : public Father { public: virtual void printM() { cout << "越位溢出" << endl; } }; void func(int a, int b) { if (a == 0) { throw SonNULL(); } if (b == 0) { throw SonOut(); } } void test02() { int a = 0; int b = 10; try { func(a, b); } catch (Father &f)//3.父類引用指向子類對象 { f.printM(); } } ~~~