class student
{
public:
int number;
int chinese;
int math;
int english;
int total;
};
void _tswap(student &a,student &b)
{
int t;
t=a.number;a.number=b.number;b.number=t;
t=a.chinese;a.chinese=b.chinese;b.chinese=t;
t=a.math;a.math=b.math;b.math=t;
t=a.english;a.english=b.english;b.english=t;
t=a.total;a.total=b.total;b.total=t;