UC知道c++高手进,关于 no matching function for call to
来源：百度知道 编辑：UC知道 时间：2024/05/26 18:47:13
#include<iostream>
#include<math.h>
using namespace std;
class Point
{
private:
float x,y;
public:
Point(float x0,float y0){x=x0;y=y0;};
float getx(){return x;};
float gety(){return y;};
void setPoint(float x,float y);
float distance(Point a,Point b);
};
void Point:: setPoint(float x0,float y0)
{
x=x0;
y=y0;
}
float Point:: distance(Point a,Point b)
{
float d;
d=sqrt((a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y));
return d;
}
class Rectangle
{
private:
Point a,b;//a表示左上角那个点，b表示右下角那个点
public:
Rectangle(float x1,float y1,float x2,float y2);
float size(Rectangle t);
void setRec(void);
};
Rectangle
#include<math.h>
using namespace std;
class Point
{
private:
float x,y;
public:
Point(float x0,float y0){x=x0;y=y0;};
float getx(){return x;};
float gety(){return y;};
void setPoint(float x,float y);
float distance(Point a,Point b);
};
void Point:: setPoint(float x0,float y0)
{
x=x0;
y=y0;
}
float Point:: distance(Point a,Point b)
{
float d;
d=sqrt((a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y));
return d;
}
class Rectangle
{
private:
Point a,b;//a表示左上角那个点，b表示右下角那个点
public:
Rectangle(float x1,float y1,float x2,float y2);
float size(Rectangle t);
void setRec(void);
};
Rectangle
没有匹配的构造函数。因为你替换了Point的默认构造函数，在Rectangle::Rectangle(float x1,float y1,float x2,float y2)
{
a.setPoint(x1,y1);
b.setPoint(x2,y2);
}
没有办法初始化，解决办法有两个，第一个是用Rectangle::Rectangle(float x1,float y1,float x2,float y2)：a(0,0）,b（0,0）手动初始化
第二个是添加一个无参数的Point构造函数
问题:
a.setPoint(x1,y1); b.setPoint(x2,y2);
以上两个操作的前提是a,b为Point类的实例,但之前你并没有用Point类的构造函数对a,b进行构造
解决办法:
将Point类的构造函数的参数列表中添加默认参数
Point(float x0,float y0){x=x0;y=y0;};
改为Point(float x0=0.0,float y0=0.0){x=x0;y=y0;};