📄 fraction.h.html

📁 《Big C++ 》Third Edition电子书和代码全集-Part1
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<pre> 1  #ifndef FRACTION_H
 2  #define FRACTION_H
 3  
 4  #include &lt;iostream&gt;
 5  
 6  using namespace std;
 7  
 8  class Fraction
 9  {
10  public:
11     /**
12     Constructs a fraction with numerator 0 and denominator 1.
13     */
14     Fraction();
15  
16     /**
17        Constructs a fraction with numerator t and denominator 1.
18        @param t the numerator for the fraction
19     */
20     Fraction(int t);
21  
22     /**
23        Constructs a fraction with given numerator and denominator.
24        @param t the initial numerator
25        @param b the initial denominator
26     */
27     Fraction(int t, int b);
28  
29     /**
30        Returns the numerator.
31        @return the numerator value
32     */
33     int numerator() const;
34  
35     /**
36        Returns the denominator.
37        @return the denominator value
38     */
39     int denominator() const;
40  
41     /**
42        Updates a fraction by adding in another fraction value.
43        @param right the fraction to be added
44        @return the updated fraction value
45     */
46     Fraction& operator+=(const Fraction& right);
47  
48     /**
49        Increment fraction by 1.
50     */
51     Fraction& operator++(); // Prefix form
52     Fraction operator++(int unused); // Postfix form
53  
54     /**
55        Converts a fraction into a floating-point value.
56        @return the converted value
57     */
58     operator double() const;
59  
60     /**
61        Compare one fraction value to another.
62        Result is negative if less than right, zero if equal, and
63        positive is greater than right.
64        @param right the fraction to be compared against
65     */
66     int compare(const Fraction& right) const;
67  private:
68     /**
69        Place the fraction in least common denominator form.
70     */
71     void normalize();
72     /**
73        Compute the greatest common denominator of two integer values.
74        @param n the first integer
75        @param m the second integer
76     */
77     int gcd(int n, int m);
78     int top;
79     int bottom;
80  };
81  
82  Fraction operator+(const Fraction& left, const Fraction& right);
83  Fraction operator-(const Fraction& left, const Fraction& right);
84  Fraction operator*(const Fraction& left, const Fraction& right);
85  Fraction operator/(const Fraction& left, const Fraction& right);
86  Fraction operator-(const Fraction& value);
87  
88  bool operator&lt;(const Fraction& left, const Fraction& right);
89  bool operator&lt;=(const Fraction& left, const Fraction& right);
90  bool operator==(const Fraction& left, const Fraction& right);
91  bool operator!=(const Fraction& left, const Fraction& right);
92  bool operator&gt;=(const Fraction& left, const Fraction& right);
93  bool operator&gt;(const Fraction& left, const Fraction& right);
94  
95  ostream& operator&lt;&lt;(ostream& out, const Fraction& value);
96  istream& operator&gt;&gt;(istream& in, Fraction& r);
97  
98  #endif</pre>
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