将私有变为公有

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#include <iostream>using namespace std;class Student{private:int num;char name[20];char sex;public:void set_data(int n, char *p,char s){num=n;strcpy(name,p);sex=s;}void display( ){cout<<"num: "<<num<<endl;cout<<"name: " <<name<<endl;cout<<"sex: " <<sex<<endl;}};int main(){ Student stud1,stud2; //(1)stud1.set_data(1,"He",'f');stud1.display();  //(2)stud2.set_data(2,"She",'m'); //(3)stud2.sex='f';stud2.display(); //(5)return 0;}

以上代码出现了一个将私有作为公有运用的问题：
C:\Documents and Settings\Administrator\Cpp2.cpp(28) : error C2248: 'sex' : cannot access private member declared in class 'Student'
改正方法：

#include <iostream>
using namespace std;
class Student
{
private:
int num;
char name[20];

public:
char sex;
void set_data(int n, char *p,char s)
{
num=n;
strcpy(name,p);
sex=s;
}
void display( )
{
cout<<"num: "<<num<<endl;
cout<<"name: " <<name<<endl;
cout<<"sex: " <<sex<<endl;
}
};
int main()
{ Student stud1,stud2; //(1)
stud1.set_data(1,"He",'f');
stud1.display(); //(2)
stud2.set_data(2,"She",'m'); //(3)
stud2.sex='f';
stud2.display(); //(5)
return 0;
}

运行结果：

心得体会：这样就实现了转变。