求解C++继承类构造函数的简单问题(类内声明,类外定义)

Question

class person
{
public:
person(int num1, string name1);
..
private:
int num;
string name;
};
person::person(int num1, string name1)
{
num = num1;
name = name1;
}

class student :public person
{
public:
student(int num1, string name1, int cnum1, float score1) :person(num1, name1);
...
private:
int cnum;
float score;
};

student::student(int num1, string name1, int cnum1, float score1) :person(num1, name1)
{
cnum = cnum1;
score = score1;
}

继承类的构造函数,在类内定义,类外声明,这种方式为什么不可以编译?

Answer 1

声明的时候不能调用基类的构造函数，定义的时候才可以，因此，建议改为：
class person
{
public:
person(int num1, string name1);
..
private:
int num;
string name;
};
person::person(int num1, string name1)
{
num = num1;
name = name1;
}
class student :public person
{
public:
student(int num1, string name1, int cnum1, float score1) ;
...
private:
int cnum;
float score;
};
student::student(int num1, string name1, int cnum1, float score1) :person(num1, name1)
{
cnum = cnum1;
score = score1;
}