【鱼c】C++运算符重载练习

  1 #include<iostream>
  2 #include<stdlib.h>
  3 using namespace std;
  4 class Rational
  5 {
  6     public:
  7         Rational(int num,int denom);
  8         Rational operator+(Rational rhs);
  9         Rational operator-(Rational rhs);
 10         Rational operator*(Rational rhs);
 11         Rational operator/(Rational rhs);
 12         
 13         void print();
 14         
 15     private:
 16 
 17         void normalize();
 18 
 19         int numerator;
 20         int denominator;
 21 };
 22 
 23 Rational::Rational(int num,int denom)
 24 {
 25     numerator = num;
 26     denominator = denom;
 27     normalize();
 28 }
 29 void Rational::normalize()
 30 {
 31     if(denominator < 0)
 32     {
 33         numerator = -numerator;
 34         denominator = -denominator;
 35     }
 36     int a = abs(numerator);
 37     int b = abs(denominator);
 38     
 39     while(b>0)
 40     {
 41         int t = a % b;
 42         a = b;
 43         b = t;
 44     }
 45     
 46     numerator /= a;
 47     denominator /= a;
 48 }
 49 Rational Rational::operator+(Rational rhs)
 50 {
 51     int a = numerator;
 52     int b = denominator;
 53     int c = rhs.numerator;
 54     int d = rhs.denominator;
 55     
 56     int e = a*b + c*d;
 57     int f = b*d;
 58 
 59     return Rational(e,f);
 60 }
 61 
 62 Rational Rational::operator-(Rational rhs)
 63 {
 64     int a = numerator;
 65     int b = denominator;
 66     int c = rhs.numerator;
 67     int d = rhs.denominator;
 68 
 69     int e = a*b - c*d;
 70     int f = b*d;
 71 
 72     return Rational(e,f);
 73 }
 74 Rational Rational::operator*(Rational rhs)
 75 {
 76     int a = numerator;
 77     int b = denominator;
 78     int c = rhs.numerator;
 79     int d = rhs.denominator;
 80 
 81     int e = a*c;
 82     int f = b*d;
 83 
 84     return Rational(e,f);
 85 }
 86 Rational Rational::operator/(Rational rhs)
 87 {
 88     int a = numerator;
 89     int b = denominator;
 90     int c = rhs.numerator;
 91     int d = rhs.denominator;
 92 
 93     int e = a*d;
 94     int f = b*c;
 95 
 96     return Rational(e,f);
 97 }
 98 void Rational::print()
 99 {
100     if(numerator % denominator == 0)
101         cout << numerator / denominator;
102     else
103         cout << numerator << "/" << denominator;
104 }
105 int main()
106 {
107     Rational f1(2,16);
108     Rational f2(15,16);
109     f1.print();
110     cout << "+";
111     f2.print();
112     cout << "=";
113     Rational res = f1 + f2;
114     res.print();
115     cout << endl;
116     
117     f1.print();
118     cout << "-";
119     f2.print();
120     cout << "=";
121     res = f1 - f2;
122     res.print();
123     cout << endl;
124 
125     f1.print();
126     cout<< "*";
127     f2.print();
128     cout<< "=";
129     res = f1 * f2;
130     res.print();
131     cout << endl;
132 
133     f1.print();
134     cout << "/";
135     f2.print();
136     cout << "=";
137     res = f1 / f2;
138     res.print();
139     cout << endl;
140     system("pause");
141     
142     return 0;
143 }