Question

编程遇到问题，求大虾指点，万分感谢！

#include<iostream>
#include<string>
using namespace std;
class Data
{
public:
Data(string name1,char sex1,int age1);

virtual ~Data() {}
void print()
{
cout<<"name:"<<name<<endl;
cout<<"sex:"<<sex<<endl;
cout<<"age:"<<age<<endl;
}
protected:
string name;
char sex;
int age;
};
class Student: public Data
{
Student(string name1,char sex1,int age1,string major1,double score1):Data(name1,sex1,age1)
{
major=major1;
score=score1;

}
~Student() {}
void print()
{
Data::print();
cout<<"major:"<<major<<endl;
cout<<"score:"<<score<<endl;
}
protected:
string major;
double score;
};
Data::Data(string name1,char sex1,int age1)
{
name=name1;
sex=sex1;
age=age1;
}
int main()
{
Student mystudent("小明",'m,22,"应用数学”，90);
cout<<"Student:"<<endl;
student.print();
return 0;
}

错误，不懂为什错？
Compiling...
¹ÜÀí.cpp
D:\Program Files (x86)\Microsoft Visual Studio\MyProjects\Êý¾Ý\¹ÜÀí.cpp(52) : error C2018: unknown character '0xa3'
D:\Program Files (x86)\Microsoft Visual Studio\MyProjects\Êý¾Ý\¹ÜÀí.cpp(52) : error C2018: unknown character '0xbb'
D:\Program Files (x86)\Microsoft Visual Studio\MyProjects\Êý¾Ý\¹ÜÀí.cpp(53) : error C2248: 'Student::Student' : cannot access private member declared in class 'Student'
D:\Program Files (x86)\Microsoft Visual Studio\MyProjects\Êý¾Ý\¹ÜÀí.cpp(24) : see declaration of 'Student::Student'
D:\Program Files (x86)\Microsoft Visual Studio\MyProjects\Êý¾Ý\¹ÜÀí.cpp(53) : error C2248: 'Student::~Student' : cannot access private member declared in class 'Student'
D:\Program Files (x86)\Microsoft Visual Studio\MyProjects\Êý¾Ý\¹ÜÀí.cpp(31) : see declaration of 'Student::~Student'
D:\Program Files (x86)\Microsoft Visual Studio\MyProjects\Êý¾Ý\¹ÜÀí.cpp(53) : error C2146: syntax error : missing ';' before identifier 'cout'
D:\Program Files (x86)\Microsoft Visual Studio\MyProjects\Êý¾Ý\¹ÜÀí.cpp(54) : error C2065: 'student' : undeclared identifier
D:\Program Files (x86)\Microsoft Visual Studio\MyProjects\Êý¾Ý\¹ÜÀí.cpp(54) : error C2228: left of '.print' must have class/struct/union type

Answer 1

#include<iostream>
#include<string>
using namespace std;
class Data
{
public:
Data(string name1,char sex1,int age1);

virtual ~Data() {}
void print()
{
cout<<"name:"<<name<<endl;
cout<<"sex:"<<sex<<endl;
cout<<"age:"<<age<<endl;
}
protected:
string name;
char sex;
int age;
};
class Student: public Data
{
public://加个public，不然你的构造函数是私有的，print函数也是私有的，在main中无法调用
Student(string name1,char sex1,int age1,string major1,double score1):Data(name1,sex1,age1)
{
major=major1;
score=score1;

}
~Student() {}
void print()
{
Data::print();
cout<<"major:"<<major<<endl;
cout<<"score:"<<score<<endl;
}
protected:
string major;
double score;
};
Data::Data(string name1,char sex1,int age1)
{
name=name1;
sex=sex1;
age=age1;
}
int main()
{
Student mystudent("小明",'m',22,"应用数学",90);//你有些符号写成了全角，'m那里又漏了一个引号
cout<<"Student:"<<endl;
mystudent.print();//你写成了student，改成mystudent
return 0;
}

Answer 2

构造函数前面少了public:
Student mystudent("小明",'m,22,"应用数学”，90);这一行90前面的逗号输入法有问题，改为英文输入的逗号