前辈们好,偶才接触C++几天,已经被 类 的概念弄的头昏脑涨
这是我写的一个求长方形面积的代码,(感觉自己写复杂化了)
为什么面积...
请前辈们帮忙,解答一下,顺便指示下写的这些代码哪些是多余的.
不胜感激..
#include <iostream>
using namespace std;

class Rectangle
{
public:
Rectangle( double = 1.0, double = 1.0, double = 0.0);

void setRectangle( double, double, double );

void setlength( double );
void setwidth( double );
void setarea( double );

double getarea( );

private:
double length;
double width;
double area;
};

Rectangle::Rectangle( double len, double wid, double are)
{
setRectangle( len, wid, are);
}

void Rectangle::setRectangle( double l, double w, double a)
{
setlength( l );
setwidth( w );
setarea( a );
}

void Rectangle::setlength( double l )
{
length = ( l >= 0.0 && l <= 20.0 ) ? l : 0;
}

void Rectangle::setwidth( double w )
{
width = ( w >= 0.0 && w <= 20.0 ) ? w : 0;
}

void Rectangle::setarea( double a )
{
area = length * width;
}

double Rectangle::getarea()
{
return area;
}

int main()
{
double a, b;
Rectangle t;
cout << "input a and b value: " ;
cin >> a >> b;
t.setlength( a );
t.setwidth( b);
cout << "area = " << t.getarea() << endl;
return 0;
}

#include <iostream>
using namespace std;

class Rectangle
{
	public:
		Rectangle(double, double);

		double getarea( );

	private:
		double length;
		double width;
		double area;
};

Rectangle::Rectangle( double len, double wid )
{
	if (len <= 0.0 || len >= 20.0 || wid <= 0.0 || wid >= 20.0)
	{
		area = 0.0;
		return;
	}
	area = len *wid;
}

double Rectangle::getarea()
{
	return area;
}

int main()
{
	double a, b;
	cout << "input a and b value: " ;
	cin >> a >> b;
	Rectangle t(a, b);
	cout << "area = " << t.getarea() << endl;
	return 0;
}

我刚学到类，听说类是c++的精华，不知对不对，但看来学好它是十分必要的。