7iii.cpp

C/C++程序设计导论（第二版）》程序源文件

#include <iostream.h>
// AverageInput3 ()  Input positive values until a negative
// sentinel value is encounter. Return the average.
//  ASSUMPTION: at least one value is entered.
//  OUT:  count -- the number of values averaged
float AverageInput3 (int& count)
{	float sum = 0.0, value;
	cin >> value;
	for (count=0; value > 0.0; count=count+1)
	{	sum = sum + value;
		cin >> value;
	}
	return (sum / count);
}
void main ()
 { int n;
	cout << AverageInput3 (n);
	cout << n << endl;
 }