哥的第一个C++

哥人生的第一个C++，麻烦的类啊。。   

#include<iostream>
#include<cmath>
#include<cstdlib>
#include<cstring>
using namespace std;
class Cs
{
	public:
		float Ave(  );
		void Print(  )
		{
			cout<<"姓名"<<name<<endl;
			cout<<"学号"<<No<<endl;
			cout<<"课程成绩："<<score[0]<<"  "<<score[1]<<"  "<<score[2]<<endl;
			cout<<"平均成绩："<<ave<<endl; 
		}
		void setname( char str[] )
		{
			strcpy( name,str );
		}
		void setNo( char str[] )
		{
			strcpy( No,str );
		}
		void setscore( float s1,float s2,float s3 )
		{
			score[0] = s1,score[1] = s2,score[2] = s3; 
		}
	private:
		char name[20],No[10];
	private:
		float score[3],ave;
};
float Cs::Ave(  )
{
	ave = ( score[0] + score[1] + score[2] ) / 3;
	return ave;
}
int main(  )
{
	Cs one,*stu;
	stu = &one;
	one.setname( "Lili" );
	one.setNo( "10408200314" );
	one.setscore( 1,2,3 );
	one.Ave();
	one.Print(  );
	system( "pause" );
	return 0;
}