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);
