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写出程序运行结果:_________#include using namespace std;class Base1{public: virtual void display() const = 0;};class Base2: public Base1{public: void display() const;};void Base2::display() const { cout << "Base2::display()" << endl;}class Derived: public Base2{ public: void display() const;};void Derived::display() const { cout << "Derived::display()" << endl;}void fun(Base1 *ptr){ ptr->display(); }int main(){ Base2 base2; Derived derived; fun(&base2); fun(&derived); return 0;}
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写出程序运行结果:_________#include //using namespace std;class Complex{ public: Complex(double r = 0.0, double i = 0.0) : real(r), imag(i) { } friend Complex operator + (const Complex &c1, const Complex &c2); friend Complex operator - (const Complex &c1, const Complex &c2); friend ostream & operator << (ostream &out, const Complex &c);private: double real; double imag;}; Complex operator + (const Complex &c1, const Complex &c2){ return Complex(c1.real + c2.real, c1.imag + c2.imag);}Complex operator - (const Complex &c1, const Complex &c2) { return Complex(c1.real - c2.real, c1.imag - c2.imag);}ostream & operator << (ostream &out, const Complex &c) { out << "(" << c.real << "," << c.imag <<")"; return out;}int main() { Complex c1(5, 4), c2(2, 10), c3; cout << "c1=" << c1 << endl; cout << "c2=" << c2 << endl; c3 = c1 - c2; cout << "c3=c1-c2=" << c3 << endl; c3 = c1 + c2; cout << "c3=c1+c2=" << c3 << endl; return 0;}
写出程序运行结果:_________#include using namespace std;class Clock {public: Clock(int hour = 0, int minute = 0, int second = 0); void showTime() const; Clock& operator ++ (); Clock operator ++ (int);private: int hour, minute, second;};Clock::Clock(int hour, int minute, int second) { if (0 <= hour && hour < 24 && 0 <= minute && minute < 60 && 0 <= second && second < 60) {this->hour = hour;this->minute = minute;this->second = second; } elsecout << "Time error!" << endl;}void Clock::showTime() const { cout << hour << ":" << minute << ":" << second << endl;}Clock & Clock::operator ++ () { second++; if (second >= 60) {second -= 60;minute++;if (minute >= 60) {minute -= 60;hour = (hour + 1) % 24;} } return *this;}Clock Clock::operator ++ (int) { Clock old = *this; ++(*this); return old;}int main() { Clock myClock(23, 59, 59); cout << "First time output:"; myClock.showTime(); cout << "Show myClock++:"; (myClock++).showTime(); cout << "Show ++myClock:"; (++myClock).showTime(); return 0;}
写出程序运行结果:_________#include using namespace std;class Complex { public: Complex(double r = 0.0, double i = 0.0) : real(r), imag(i) { } Complex operator + (const Complex &c2) const; Complex operator - (const Complex &c2) const; void display() const;private: double real; double imag;}; Complex Complex::operator + (const Complex &c2) const { return Complex(real + c2.real, imag + c2.imag);}Complex Complex::operator - (const Complex &c2) const{ return Complex(real - c2.real, imag - c2.imag);}void Complex::display() const { cout << "(" << real << "," << imag << ")" << endl;}int main() { Complex c1(2, 5), c2(1, 2), c3; cout << "c1="; c1.display(); cout << "c2="; c2.display(); c3 = c1 - c2; cout << "c3=c1-c2="; c3.display(); c3 = c1 + c2; cout << "c3=c1+c2="; c3.display(); return 0;}
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