Total newbie problem.. corrupted stack around variable

[Georgie Fruit]

I've spent a long, long time trying to figure out what I'm doing wrong, and I still can't find it. I'm not used to Visual Studio's Debugger, and I hope you all won't mind me asking for help. I'm getting a stack around variable error, which I know is when something tries to write out of bounds. Anyway, here's the code (my first attempt at a C++ class)

#include <iostream>
#include <string>

using namespace std;

class Studentgrade
{
private:
	char student[24];
	int quizzes[4];

public:
	void askName()
{
	cout << "Please enter the student's name: ";
		cin.getline(student, 24);
		quizzes[0] = 0;
		quizzes[1] = 0;
		quizzes[2] = 0;
		quizzes[3] = 0;
}

	void setGrade(int sc, int x)
{
	if(x>=0 && x<4)
	{
		quizzes[x] = sc;
	}
}

	void getName(char name[]) const
{
	strcpy_s(name, strlen(name), student);
}

	float getAve() const
{
	int tot = 0;
	tot = (quizzes[0] + quizzes[1] + quizzes[2] + quizzes[3]);
	return (tot/static_cast<float>(4.0));
}
};

int main()
{
	Studentgrade sg;
	char student[24];
	sg.askName();
	sg.setGrade(100,0);
	sg.setGrade(90,1);
	sg.setGrade(100,5);
	sg.setGrade(100,3);
	sg.getName(student);
	cout << student << "'s quiz average is " << sg.getAve() << endl;
	return 0;
}

If I debug with "john smith," the string never even makes it into the sg.student instance. I guess I don't understand how member functions are supposed to write to the instance rather than original class declaration (if that makes sense)

Sigh.