# include <iostream.h>
int fun(double & ave,int & zxf)
{
	int n,x,xf;
	double sum=0.0;
	n=0;
    zxf=0;
	do
	{
		cout<<"請輸入某門功課成績(輸入負(fù)數(shù)表示所有功課輸入結(jié)束）:";
	    cin>>x;
	    cout<<"請輸入該門功課的學(xué)分：";
	    cin>>xf;
		sum+=x*xf;
		zxf+=xf;
		n++;
	}while(x>=0);
	ave=sum/zxf;
	return n-1;
}
void main()
{
	double a;int xf;
	cout<<endl;
	cout<<"功課總門數(shù)為:"<<fun(a,xf)<<endl;
	cout<<"總學(xué)分為:"<<xf<<"  ";
	cout<<" 總平均分="<<a<<endl;
}