实验三
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1.实验名称：实验三计算用户输入的两点确定的直线长度和斜率。
2.实验时间：2008-4-1
3.实验目的：编程用面向对象设计思想分析、设计并实现实验三的内容。
4.实验内容：两点决定一条直线，请编程首先计算由起点（1，2）与终点（26，49）确定的直线长度和斜率，然后，计算用户输入的两点确定的直线长度和斜率。在程序中首先声明一个类Point，然后利用它声明一个组合类Line，并按要求编写测试程序。
//程序源代码
//Line.h
#include <iostream.h>
#include <math.h>
class Point
{
private:
float x,y;
public:
Point(float a,float b)
{
x=a;
y=b;
}
float getX()
{
return x;
}
float getY()
{
return y;
}
};
class Line
{
private:
Point Pa,Pb;
public:
Line(float x1,float y1,float x2,float y2);
float getLength();
float getSlope();
};
Line::Line(float x1,float y1,float x2,float y2):Pa(x1,y1),Pb(x2,y2)
{
}
float Line::getLength()
{
return (float)sqrt(double((Pa.getX()-Pb.getX())*(Pa.getX()-Pb.getX())+(Pa.getY()-Pb.getY())*(Pa.getY()-Pb.getY())));
}
float Line::getSlope()
{
return (Pa.getY()-Pb.getY())/(Pa.getX()-Pb.getX());
}
void main()
{
float x1,y1,x2,y2;
Line L1(1,2,26,49);
cout<<"the length of two points is:"<<L1.getLength()<<endl;
cout<<"the slope of the line is:"<<L1.getSlope()<<endl;
cout<<"please inputs the information of two ponits which like '1 2 26 49' is separated by a blank space!"<<endl;
cin>>x1>>y1>>x2>>y2;
Line L2(x1,y1,x2,y2);
cout<<"the length of two points of user's inputs is:"<<L2.getLength()<<endl;
cout<<"the slope of the line of user's inputs is:"<<L2.getSlope()<<endl;
}//end main()
/**************************************************************************
* (C) Copyright 1992-2005 by Deitel & Associates, Inc. and *
* Pearson Education, Inc. All Rights Reserved. *
* *
* DISCLAIMER: The authors and publisher of this book have used their *
* best efforts in preparing the book. These efforts include the *
* development, research, and testing of the theories and programs *
* to determine their effectiveness. The authors and publisher make *
* no warranty of any kind, expressed or implied, with regard to these *
* programs or to the documentation contained in these books. The authors *
* and publisher shall not be liable in any event for incidental or *
* consequential damages in connection with, or arising out of, the *
* furnishing, performance, or use of these programs. *
**************************************************************************/
//实验结果
/*result:
the length of two points is:53.2353
the slope of the line is:1.88
please inputs the information of two ponits which like '1 2 26 49' is separated
by a blank space!
1 1 99 99
the length of two points of user's inputs is:138.593
the slope of the line of user's inputs is:1
Press any key to continue
*/
5.实验总结：对了sqrt();有三种情况,放到它上面就会看到从1到3的小三角按钮!
第一种是int；第二种是array...&；第三种是double；
对组合类的使用有进一步深入。
