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CHAPTER1-20.cpp
Package: c++stl程序员开发指南.rar [view]
Upload User: fjc899
Upload Date: 2007-07-03
Package Size: 187k
Code Size: 1k
Category:
STL
Development Platform:
C/C++
- //文件名:CHAPTER1-20.cpp
- #include <iostream.h>
- #include <math.h>
- class Point
- {
- public:
- Point(double xx, double yy) { x=xx; y=yy; }
- void Getxy();
- friend double Distance(Point &a, Point &b);
- private:
- double x, y;
- };
- void Point::Getxy()
- {
- cout<<"("<<x<<","<<y<<")"<<endl;
- }
- double Distance(Point &a, Point &b)
- {
- double dx = a.x - b.x;
- double dy = a.y - b.y;
- return sqrt(dx*dx+dy*dy);
- }
- void main()
- {
- Point p1(3.0, 4.0), p2(6.0, 8.0);
- p1.Getxy();
- p2.Getxy();
- double d = Distance(p1, p2);
- cout<<"Distance is "<<d<<endl;
- }