#include<iostream.h>
int level(int grade,int& typeA,int& typeB,int& typeC);
void main(){
	int typeA=0,typeB=0,typeC=0;
	int student=9;
	int array[9]={90,65,78,54,21,68,87,69,58};
	for(int i=0;i<student;i++)
		level(array[i],typeA,typeB,typeC);
	cout<<"A類學生數："<<typeA<<endl;
	cout<<"B類學生數："<<typeB<<endl;
	cout<<"C類學生數："<<typeC<<endl;
}
int level(int grade,int& typeA,int& typeB,int& typeC){
	if(grade>=80)return  ++typeA;
	else if(grade>=60)return  ++typeB;
	else return ++typeC;
}