include <iostream> using namespace std; class Point { int _x, _y; public: Point(int x=0, int y=0) : _x(x), _y(y) {} Point& operator++(); Point operator++(int); Point& operator--(); Point operator--(int); friend ostream& operator << (ostream& o, const Point& p); };

#include <iostream>

#include <iostream> #include <iomanip> using namespace std; int main() { int n,i,k=0; cin>>n; for(i=n*n;i>=1;i--) { cout<<setw(5)<<i; k++; if(k%n==0) cout<<endl; } cout<<endl; return 0;

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Point(double x, double y) : x(x), y(y) {} double distance(const Point& other) const { return sqrt((x - other.x) * (x - other.x) + (y - other.y) * (y - other.y)); } }; int main() { Point p1(3, 4...

判断两条直线是否垂直，部分代码提供，“***” 部分请补充完整。 #include <iostream> using namespace std ; class point //定义点类 { public: point() ; int get_x() ; int get_y() ; private: int x, y ; } ; point::point() { int r,c; cin >>r; cin >>c; x = r; y

#include <iostream> using namespace std; class point { // 定义点类 public: point(); int get_x(); int get_y(); private: int x, y; }; point::point() { int r, c; cin >> r; cin >> c; x = r; y =...

声明 Point 类，有坐标 _ x，_ y 两个成员变量；对Point 类重载“++”（自增）、“--”（自减）运算符，实现对坐标值的改变include <iostream> using namespace std; class Point { int _x, _y; public: Point(int x=0, int y=0) : _x(x), _y(y) {} Point& operator++(); Point operator++(int); Point& operator--(); Point operator--(int); friend ostream& operator << (ostream& o, const Point& p); };

Point(int x=0, int y=0) : _x(x), _y(y) {} Point& operator++(); Point operator++(int); Point& operator--(); Point operator--(int); friend ostream& operator << (ostream& o, const Point& p); ...

#include<iostream> using namespace std; class Point{ int x,y; public: Point(int x=0,int y=0) { this->x=x,this->y=y; } void move(int offx,int offy) { x+=offx,y+=offy; } void showxy() { cout<<"("<<x<<","<<y<<")"<<endl; } }; const double pi=3这段代码有错误吗

这段代码没有语法错误。但是，常量 pi 的定义可能是不正确的。在代码中，它被定义为 3，而不是 3.14 或其他浮点数。通常情况下，我们将 pi 定义为一个具有足够精度的浮点数，如下所示： c++ ...

分析以下代码#include <iostream> #include <memory> using namespace std; class Point { public: Point(int ix = 0, int iy = 0): _ix(ix), _iy(iy) { cout << "Point(int,int)" << endl; } shared_ptr addPoint(Point & pt) { _ix += pt._ix; _iy += pt._iy; return shared_ptr(this); } ~Point() { cout << "~Point()" << endl; } private: int _ix; int _iy; }; int main() { shared_ptr sp(new Point(1, 2)); shared_ptr sp2(new Point(11, 12)); shared_ptr sp3(sp->addPoint(*sp2)); }

这段代码定义了一个 Point 类，其中包含两个私有变量 _ix 和 _iy 分别表示点的横坐标和纵坐标。在 main 函数中，分别定义了三个 shared_ptr 智能指针对象 sp、sp2 和 sp3，其中 sp 和 sp2 分别指向两个 Point 类型的...

以下代码有什么问题? #include <iostream> #include <memory> using namespace std; class Point { public: Point(int ix = 0, int iy = 0): _ix(ix), _iy(iy) { cout << "Point(int,int)" << endl; } shared_ptr addPoint(Point & pt) { _ix += pt._ix; _iy += pt._iy; return shared_ptr(this); } ~Point() { cout << "~Point()" << endl; } private: int _ix; int _iy; }; int main() { shared_ptr sp(new Point(1, 2)); shared_ptr sp2(new Point(11, 12)); shared_ptr sp3(sp->addPoint(*sp2)); }

这段代码的问题是，addPoint 函数返回的是 shared_ptr<Point>(this)，这意味着返回的智能指针与函数内部创建的临时智能指针共享同一个对象，因此会导致内存泄漏。因为当 addPoint 函数返回时，临时智能指针会...

以下程序执行后为什么sp3的引用计数为2？#include <memory> #include <iostream> using namespace std; class Point : public std::enable_shared_from_this { public: Point(int ix = 0, int iy = 0) : _ix(ix) , _iy(iy) { cout << "Point(int,int)" << endl; } ~Point() { cout << "~Point()" << endl; } shared_ptr addPoint(Point & pt) { _ix += pt._ix; _iy += pt._iy; return shared_from_this(); } private: int _ix; int _iy; }; void test() { shared_ptr sp1(new Point(1, 2)); shared_ptr sp2(new Point(11, 12)); shared_ptr sp3(sp1->addPoint(*sp2)); cout << "sp1.use_count = " << sp1.use_count() << endl; cout << "sp2.use_count = " << sp2.use_count() << endl; cout << "sp3.use_count = " << sp3.use_count() << endl; } int main() { test(); return 0; }

这是因为在类 Point 中使用了 std::enable_shared_from_this，它是一个模板类，可以让一个对象 shared_ptr 类型的智能指针来管理。在类 Point 中，addPoint 函数返回的是 shared_from_this()，它会返回一个指向此...

#include <iostream> using namespace std; class Point { public: int x, y; Point(int x = 0, int y = 0) : x(x), y(y) {} }; void displayPoint(const Point& p) { cout << "(" << p.x << "," << p.y << ")" << endl; } int main() { displayPoint(1); Point p = 1; cout << "Hello World!" << endl; return 0; } 1是怎么转换成Point的

这个构造函数允许使用一个整数参数来初始化Point对象的x和y成员变量。当传递一个整数值给Point对象时，编译器将自动调用这个构造函数来创建一个临时的Point对象。然后，这个临时对象被传递给displayPoint函数进行...

#include<iostream> #include<vector> #include<cmath> using namespace std; class point { private: int x,y; public: point(int x=0,int y=0):x(x),y(y){} void coutt () { cout << "[" <<x<<","<<y<<"]"<< endl; } }; int main() { int i,n; vector<int>x(100); vector<int>y(100); vectorm(100); for(i=0;i<100;i++) { cin >>x[i]>>y[i]; m[i]=point(x[i],y[i]); } n=x.size()-1; for(;n>=0;n--) m[n].coutt; return 0; } 有什么错

point(int x = 0, int y = 0) : x(x), y(y) {} void coutt() { cout << "[" << x << "," << y << "]" << endl; } }; int main() { int i, n; vector<int> x(100); vector<int> y(100); vector<point> m(100...

改正以下程序中的错误，并分析错误原因，不得更改主函数。 #include<iostream> using namespace std; class Point { private: int x1,x2; public: Point(int x,int y) {x1=x;x2=y;} int x_cord(){return x1;} int y_cord(){return x2;} } main() { Point data(5,6); cout<<data.x_cord()<<endl; cout<<data.y_cord()<<endl; Point more_data[20]; }

#include<iostream> using namespace std; class Point { private: int x, y; public: Point(int x, int y) { this->x = x; this->y = y; } int x_cord() { return x; } int y_cord() { return ...

#include <iostream> using namespace std; int count = 0; class Point { int x, y; public: Point() { x = 1; y = 1; count++; } ~Point() { count--; } friend void play(); }; void play() { count++; } void main() { Point a; play(); { Point b[5]; play(); } play(); cout << count << endl; }输出结果

#include <iostream> using namespace std; int count = 0; class Point { int x, y; public: Point() { x = 1; y = 1; count++; } ~Point() { count--; } friend void play(); }; void play() { count...

#include<iostream> using namespace std; class Point { protected: int x, y; public: Point(int a, int b) { x = a; y = b; } int getX() { return x; } int getY() { return y; } }; class Circle :public Point { protected: int radius; public: Circle(int a = 0, int b = 0, int r = 0) { radius = r; } int getRadius() { return radius; } }; void main() { Circle c(100, 150, 200); cout << "x=" << c.getX() << ",y=" << c.getY() << ",radius" << c.getRadius() << endl; }

Point 类表示平面上的一个点，包含 x 和 y 坐标；Circle 类表示平面上的一个圆，它除了继承 Point 类的 x 和 y 坐标外，还包含一个半径 radius。程序的主函数中创建了一个 Circle 对象 c，并输出它的 x、y 坐标和...

#include<iostream> #include<iomanip> #include<cmath> using namespace std; class point { private: int x,y; public: point(int x,int y):x(x),y(y){} void coutt () { cout << "[" <<x<<","<<y<<"]"<< endl; } }; int main() { int i,n; vector a(2); string x,y; for(i=0;i<100;i++) { getline(cin,x,' '); getline(cin,y); a[i]={x,y} } n=a.size()-1; for(;n>=0;n--) a[n].ccout; return 0; } 有什么错误

point(int x,int y):x(x),y(y){} void coutt() { cout << "[" <<x<<","<<y<<"]"<< endl; } }; int main() { int i,n; vector<point> a(2); string x,y; for(i=0;i<2;i++) { getline(cin,x,' '); ...

#include <iostream> using namespace std; class Point{ public: Point(int x1); int getx() { return x; } protected: int x; }; Point::Point(int x1) { x=x1; cout<<"执行基类的构造函数"<<endl; } class Circle:public Point{ public: Circle(int x1,int y1); int gety() { return y; } protected: int y; }; Circle::Circle(int x1,int y1):Point(x1) { y=y1; cout<<"执行派生类的构造函数"<<endl; } int main() { Circle c(2,1); cout<<"x="<<c.getx<<endl; cout<<"y="<<c.gety<<endl; return 0; }

#include <iostream> using namespace std; class Point{ public: Point(int x1); int getx() { return x; } protected: int x; }; Point::Point(int x1) { x=x1; cout<<"执行基类的构造函数"<<endl; }...

#include <iostream> using namespace std; class Point { public: Point(){X=0;Y=0;} Point(int x,int y){X=x;Y=y;} void copy(Point& obj)； void displayxy(); private: int X,Y;}; int main() {Pointobj1(10,20), obj2; void Point::displayxy0{ cout<<X<<""; cout<<Y<<endl; void Point::copy(Point& obj){ if (this!=&obj) *this=obj; obj2.copy(obj1); 113141300 obj1.displayxy0; obj2.displayxy0; return0;}

#include <iostream> using namespace std; class Point { public: Point() { X = 0; Y = 0; } Point(int x, int y) { X = x; Y = y; } void copy(Point& obj) { if (this != &obj) *this = obj; } void ...

#include <iostream> using namespace std; class Point { int _x, _y; public: Point(int x=0, int y=0) : _x(x), _y(y) {} Point& operator++(); Point operator++(int); Point& operator--(); Point operator--(int); friend ostream& operator << (ostream& o, const Point& p); }; / Begin / / End / ostream& operator << (ostream& o, const Point& p) { o << '(' << p._x << ", " << p._y << ')'; return o; } int main() { int x,y; cin>>x>>y; Point p(x, y); cout << p << endl; cout << p++ << endl; cout << ++p << endl; cout << p-- << endl; cout << --p << endl; return 0; }

Point(int x=0, int y=0) : _x(x), _y(y) {} Point& operator++(); Point operator++(int); Point& operator--(); Point operator--(int); friend ostream& operator << (ostream& o, const Point& p); }; ...

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include <iostream> using namespace std; class Point { int _x, _y; public: Point(int x=0, int y=0) : _x(x), _y(y) {} Point& operator++(); Point operator++(int); Point& operator--(); Point operator--(int); friend ostream& operator << (ostream& o, const Point& p); };

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#include <iostream> using namespace std; int count = 0; class Point { int x, y; public: Point() { x = 1; y = 1; count++; } ~Point() { count--; } friend void play(); }; void play() { count++; } void main() { Point a; play(); { Point b[5]; play(); } play(); cout << count << endl; }输出结果

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判断两条直线是否垂直，部分代码提供，“***” 部分请补充完整。 #include <iostream> using namespace std ; class point //定义点类 { public: point() ; int get_x() ; int get_y() ; private: int x, y ; } ; point::point() { int r,c; cin >>r; cin >>c; x = r; y