派生类中的构造函数

 1 class stu1
 2 {
 3 public:
 4     stu1(int i, string strn, double in)
 5     {
 6         ID = i;
 7         name = strn;
 8         income = in;
 9     }
10 
11 private:
12     int ID;
13     string name;
14     double income;
15 };
16 
17 class stu2 :public stu1
18 {
19 public:
20     stu2(int i, const string str, double in, string p) :stu1(i, str, in)
21     {
22         phoneNo = p;
23     }
24 
25 private:
26     string phoneNo;
27 };
28 
29 int main()
30 {
31     stu2 st(1, "Tom", 1000.02, "12345");
32 
33 }

 1 class stu1
 2 {
 3 public:
 4     stu1(int i, string strn, double in) :ID(i), name(strn), income(in) { }
 5 
 6 private:
 7     int ID;
 8     string name;
 9     double income;
10 };