9-12.cpp

能理解C++中运算符重载的需要性

#include <iostream.h>

int CircleArea()
{
	double* pd=new double;
	if(!pd)
	{
		cout<<"error memory allocation!";
		return 1;
	}
	double& rd=*pd;
	cout<<"the radius is:";
	cin>>rd;
	cout<<"the area of circle is "<<rd*rd*3.14<<endl;
	delete &rd;
	return 0;
}

void main()
{
	if(CircleArea())
		cout<<"program failed.\n";
	else
		cout<<"program successed.\n";
}