假期2.7

一、填空题

1、在下列程序的空格处填上适当的字句，使输出为：0，2，10。

#include <iostream>

#include <math.h>

class Magic

{double x;

public:

Magic(double d=0.00):x(fabs(d))

{}

Magic operator+(_ _const Magic& c_

_____)

{

return Magic(sqrt(x*x+c.x*c.x));

}

___ friend std::ostream&

____operator<<(ostream & stream,const  Magic & c)

{ stream<<c.x;

return stream;

}

};

int main()

{Magic ma;

cout<<ma<<", "<<Magic(2)<<", "<<ma+Magic(-6)+

Magic(-8)<<endl;

}

二、编程题

1、 定义复数类的加法与减法，使之能够执行下列运算：

  Complex a(2，5)，b(7，8)，c(0，0);

  c=a+b;

  c=4.1+a;

  c=b+5.6;

#include <iostream>
 
using namespace std;
 
class Complex {
 
public:
 
    Complex(double real = 0.0, double imaginary = 0.0) {
 
        this->real = real;
 
        this->imaginary = imaginary;
 
    }
 
    Complex operator+(const Complex& other) const {
 
        double resultReal = real + other.real;
 
        double resultImaginary = imaginary + other.imaginary;
 
        return Complex(resultReal, resultImaginary);
 
    }
 
    Complex operator-(const Complex& other) const {
 
        double resultReal = real - other.real;
 
        double resultImaginary = imaginary - other.imaginary;
 
        return Complex(resultReal, resultImaginary);
 
    }
 
    friend Complex operator+(double num, const Complex& complex) {
 
        double resultReal = num + complex.real;
 
        double resultImaginary = complex.imaginary;
 
        return Complex(resultReal, resultImaginary);
 
    }
 
    friend Complex operator+(const Complex& complex, double num) {
 
        return num + complex;
 
    }
 
    friend Complex operator-(double num, const Complex& complex) {
 
        double resultReal = num - complex.real;
 
        double resultImaginary = -complex.imaginary;
 
        return Complex(resultReal, resultImaginary);
 
    }
 
    friend Complex operator-(const Complex& complex, double num) {
 
        return -num + complex;
 
    }
 
    void print() const {
 
        cout << real << " + " << imaginary << "i" << endl;
 
    }
 
private:
 
    double real;
 
    double imaginary;
 
};
 
int main() {
 
    Complex a(2, 5);
 
    Complex b(7, 8);
 
    Complex c(0, 0);
 
    c = a + b;
 
    c.print();
 
    c = 4.1 + a;
 
    c.print();
 
    c = b + 5.6;
 
    c.print();
 
    return 0;
 
}

2、 编写一个时间类，实现时间的加、减、读和输出。

#include <iostream>
 
using namespace std;
 
class Time {
 
public:
 
    Time(int h = 0, int m = 0, int s = 0) {
 
        hours = h;
 
        minutes = m;
 
        seconds = s;
 
    }
 
    void setTime(int h, int m, int s) {
 
        hours = h;
 
        minutes = m;
 
        seconds = s;
 
    }
 
    void getTime(int& h, int& m, int& s) const {
 
        h = hours;
 
        m = minutes;
 
        s = seconds;
 
    }
 
    void printTime() const {
 
        cout << hours << ":" << minutes << ":" << seconds << endl;
 
    }
 
    Time operator+(const Time& other) const {
 
        int totalSeconds = seconds + other.seconds;
 
        int carryMinutes = totalSeconds / 60;
 
        int remainingSeconds = totalSeconds % 60;
 
        int totalMinutes = minutes + other.minutes + carryMinutes;
 
        int carryHours = totalMinutes / 60;
 
        int remainingMinutes = totalMinutes % 60;
 
        int totalHours = hours + other.hours + carryHours;
 
        return Time(totalHours, remainingMinutes, remainingSeconds);
 
    }
 
    Time operator-(const Time& other) const {
 
        int totalSeconds = seconds - other.seconds;
 
        int borrowMinutes = 0;
 
        if (totalSeconds < 0) {
 
            totalSeconds += 60;
 
            borrowMinutes = 1;
 
        }
 
        int totalMinutes = minutes - other.minutes - borrowMinutes;
 
        int borrowHours = 0;
 
        if (totalMinutes < 0) {
 
            totalMinutes += 60;
 
            borrowHours = 1;
 
        }
 
        int totalHours = hours - other.hours - borrowHours;
 
        return Time(totalHours, totalMinutes, totalSeconds);
 
    }
 
private:
 
    int hours;
 
    int minutes;
 
    int seconds;
 
};
 
int main() {
 
    Time t1(10, 30, 45);
 
    Time t2(2, 15, 20);
 
    Time sum = t1 + t2;
 
    Time diff = t1 - t2;
 
    cout << "t1: ";
 
    t1.printTime();
 
    cout << "t2: ";
 
    t2.printTime();
 
    cout << "Sum: ";
 
    sum.printTime();
 
    cout << "Difference: ";
 
    diff.printTime();
 
    return 0;
 
}

3、 增加操作符，以允许人民币与double型数相乘。

  friend money operator*(const money&，double);

  friend money operator*(double，const money&);

  注意：两个money对象不允许相乘。

#include <iostream>
 
using namespace std;
 
class Money {
 
private:
 
    double amount;
 
public:
 
    Money(double amt = 0.0) : amount(amt) {}
 
    friend Money operator*(const Money& money, double num) {
 
        return Money(money.amount * num);
 
    }
 
    friend Money operator*(double num, const Money& money) {
 
        return Money(money.amount * num);