C create classes and is often a member function-CodePudding

Write this code without error, but also show run successfully, but I feel the result of the outbreak is problematic, I don't have to enter, why will have to input values and, no matter how much input the final values are the same, thanks and have a great god can help solve

CodePudding user response:

Your code?

CodePudding user response:

No code, no truth,

CodePudding user response:

#include #include # define PI 3.141592 using namespace STD. Class Point {private: double x, y; Public: Point (double x_=0, double y_=0) : x (y_) {}; Double GetX (); Double GetY (); Void Change (int a, int b); Void the print (); Void the print () const; Friend a double Area (const Point& , Point&); }; Double Point: : GetX () {return x; } double Point: : GetY () {return y; } void Point: : Change (int a, int b) {double x0, y0. Cin> X0 & gt;> Y0. X=x0; Y=y0; {} void Point: : print () cout<& lt;" (" CodePudding user response:

I resend the post bar again

CodePudding user response:

Reference:

 # include 
#include 
# define PI 3.141592 
using namespace std; 

The class Point {
Private: double x, y; 
Public: Point (double x_=0, double y_=0) : x (x_), y (y_) {};//, y (y_) 
Double GetX () const; 
Double GetY () const; 
Void Change (int a, int b); 
Void the print (); 
Void the print () const; 
Friend a double Area (const Point& , Point&); 
}; 
Const double Point: : GetX () 
{
Return the x; 
} 
Const double Point: : GetY () 
{
The return of y; 
} 
The void Point: : Change (int a, int b) 
{
//double x0, y0; 
//cin> X0 & gt;> Y0. 
//x=x0; 
//y=y0; 
X=a; 
Y=b; 
} 
The void Point: : print () 
{
Cout<& lt;" ("} 
The void Point: : print () const 
{
Cout<& lt;" ("} 
Double Area (const Point & amp; P1, Point & amp; P2) 
{
Double r; 
R=SQRT ((p1) X-ray p2) x) * (p1) X-ray p2) x) + (p1) y - p2) y) * (p1) y - p2) y)); 
return PI*r*r; 
//cout} 
Int main () 
{
Const Point p1. 
P1. The print (); 
Point p2 (5, 3); 
P2. Print (); 
Cout<& lt;" S1="& lt; 
P2. Change (56, 34); 
P2. Print (); 
Cout<& lt;" S1="& lt; 
return 0; 
} 

//(0, 0) 

///(5, 3) 

//s1=106.814 
//(56, 34) 

//s1=13483.7 
//please press any key to continue...