class subject{
	String name;
	int credit;
	int score;
	public subject(String name, int credit,
	int score) {
		this.name = name;
		this.credit = credit;
		this.score = score;
	}
	void printData()
	{
		System.out.println(name);
		System.out.println("學分"+credit);
		System.out.println("成績"+score);
		System.out.println("++++++++++++++++");
	}
}
 
public class Ex1 {
	static double av(subject X[]){
		int sum=0;
		double credits=0;
		for(int i=0; i<X.length; i++){
			sum+=X[i].credit*X[i].score;
			credits+=X[i].credit;
		}
		return sum/credits;
	}
 
	public static void main(String[] args) {
		subject X[]=new subject[3];
		X[0]=new subject("程式設計", 4, 67);
		X[1]=new subject("國文", 2, 77);
		X[2]=new subject("英文", 2, 67);
		for(int i=0; i<X.length; i++)
			X[i].printData();
		System.out.println("平均："+av(X));
	}
}