My char array in my c++ program will not print anything - c++

Question

I am doing my first C++ program for my class. I am really new to this program so I have a lot to learn. In my program I am suppose to create a Student class with Undergrad/grad/gradassist derived classes. The name and SSN fields have to be in a char array (I know string makes more sense but the teacher demands a char array). The program mostly works fine except it does not print anything in my char arrays. Please help!
#include <iostream>;
using namespace std;
class Student {
protected:
char name[21];
char ssn[10];
float gpa;
int credits;
public:
Student::Student() {};
Student(const char n[], const char ss[], float& gp, int& cred) {
name[21] = n[21];
ssn[10] = ss[10];
gpa = gp;
credits = cred;
}
virtual void print() {
cout << "Name: " << name << endl;
cout << "SSN: " << ssn << endl;
cout << "GPA: " << gpa << endl;
cout << "Credits: " << credits << endl;
}
virtual float tuition() const = 0;
};
class undergrad : public Student {
protected:
float undergrad_rate;
char* year;
public:
undergrad::undergrad() {}
undergrad(float ugr, char* yr, const char n[], const char ss[], float&
gp, int& cred) :
Student(n, ss, gp, cred), undergrad_rate(ugr), year(yr){}
void set_year(char* yr) {
year = yr;
}
char* getYear() {
return year;
}
float getRate() {
return undergrad_rate;
}
void print() {
Student::print();
cout << "Undergrad rate: " << undergrad_rate << endl;
cout << "year: " << year << endl;
}
float tuition() {
//cout << "The tuition is $35000" << endl;
return 35000;
}
};
class grad : public Student {
protected:
float grad_rate;
char* thesis;
public:
};
int main(){
char* jr = "Junior";
char* sr1 = "Senior";
char* fr = "Freshman";
char* sr = "Sophmore";
undergrad g(380, jr, "M", "000111222", 4.0, 12);
g.print();
system("pause");
return 0;
}

Answer 1

The problem lies here, in the way you initialize the members name and ssn:
Student(const char n[], const char ss[], float& gp, int& cred) {
name[21] = n[21];
ssn[10] = ss[10];
There's more than one thing wrong here
name and ssn are char arrays of size 21 and size 10 respectively. This means that valid indices range from 0 to 20 and 0 to 9 respectively. So by accessing name[21] and ssn[10] you're accessing elements past the end of the allotted memory.
Even if the indices were valid, you would just be assigning a single character by doing it this way.
In order to initialize these member variables the way you're intending, do this:
Student(const char n[], const char ss[], float& gp, int& cred) {
strcpy_s(name, sizeof(name), n);
strcpy_s(ssn, sizeof(ssn), ss);
This will copy all the characters comprising the input strings into your member variables and you will get the desired output.