C/C++中组合详解及其作用介绍

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#ifndef PROJECT5_DOT_H

#define PROJECT5_DOT_H

#include <iostream>

usingnamespacestd;

classDot {

public:

doublex, y;

Dot(doublea,doubleb) : x(a), y(b) {};

voidshow() {

cout <<"x: "<< x << endl;

cout <<"y: "<< y << endl;

};

};

#endif //PROJECT5_DOT_H

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#ifndef PROJECT5_LINE_H

#define PROJECT5_LINE_H

#include "Dot.h"

classLine :publicDot {

private:

Dot d1;

Dot d2;

public:

Line(constDot &d1,constDot &d2) : Dot(0, 0), d1(d1), d2(d2) {

x = (d1.x + d2.x) / 2;

y = (d1.y + d2.y) / 2;

}

voidshow(){

Dot::show();

cout <<"dot1: ("<< d1.x <<", "<< d1.y <<")"<< endl;

cout <<"dot2: ("<< d2.x <<", "<< d2.y <<")"<< endl;

}

};

#endif //PROJECT5_LINE_H

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#include <iostream>

#include "Dot.h"

#include "Line.h"

usingnamespacestd;

intmain() {

doublea, b;

cout <<"Input Dot1: \n";

cin >> a >> b;

Dot dot1(a,b);

cout <<"Input Dot2: \n";

cin >> a >> b ;

Dot dot2(a,b);

Line l1(dot1, dot2);

l1.show();

return0;

}