博客园

分数四则运算器

好的，先弄出个类来，代码如下:
View Code 
 1 class fraction
 2 {
 3  private:
 4  int numerator;         //分子
 5  int denominator;       //分母
 6 public:
 7  fraction(int x = 0, int y = 1);
 8  ~fraction();
 9 
10  const fraction add(const fraction w);
11         const fraction add(int k);    // " + "
12 
13         const fraction sub(const fraction w);   // " - "
14         const fraction sub(int k);
15 
16         const fraction mul(const fraction w);   // " * "
17         const fraction mul(int k);
18 
19         const fraction div(const fraction w);   // " / "
20         const fraction div(int k);
21 
22           int commonden(void);
23           void show(void);
24 
25           //增加的成员函数
26           void setn(int x);      //设定分子
27           void setd(int y);      //设定分母
28           int getn(void)const;
29           int getd(void)const;
30 };

各成员实现如下：
View Code 
  1 //构造函数
  2 fraction::fraction(int x, int y)
  3 {
  4  　　numerator = x;
  5  　　if (y == 0)
  6  　　{
  7  　　　　cout << "分母为0" << endl;
  8  　　　　exit(0);
  9  　　}
 10  　　denominator = y;
 11 }
 12 
 13 fraction::~fraction()
 14 {
 15  　　//虚构函数
 16 }
 17 //加法
 18 const fraction fraction::add(const fraction w)
 19 {
 20     fraction z;
 21     z.numerator = numerator * w.denominator + w.numerator * denominator;
 22     z.denominator = denominator * w.numerator;
 23     return z;
 24 }
 25 
 26 //成员函数的重载
 27 //分数 + 整数
 28 const fraction fraction::add(int k)
 29 {
 30 fraction z;
 31 z.numerator = numerator + k*denominator;
 32 z.denominator = denominator;
 33 return z;
 34 }
 35 
 36 //减法
 37 const fraction fraction::sub(const fraction w)
 38 {
 39     fraction z;
 40     z.numerator = numerator * w.denominator - w.numerator * denominator;
 41     z.denominator = denominator * w.numerator;
 42     return z;
 43 }
 44 
 45 //成员函数的重载
 46 //分数 - 整数
 47 const fraction fraction::sub(int k)
 48 {
 49 fraction z;
 50 z.numerator = numerator - k*denominator;
 51 z.denominator = denominator;
 52 return z;
 53 }
 54 
 55 //乘法
 56 const fraction fraction::mul(const fraction w)
 57 {
 58     fraction z;
 59     z.numerator = numerator * w.numerator;
 60     z.denominator = denominator * w.denominator;
 61     return z;
 62 }
 63 
 64 //成员函数的重载
 65 //分数 * 整数
 66 const fraction fraction::mul(int k)
 67 {
 68 fraction z;
 69 z.numerator = k * numerator;
 70 z.denominator = denominator;
 71 return z;
 72 }
 73 
 74 //除法
 75 const fraction fraction::div(const fraction w)
 76 {
 77     fraction z;
 78     if (numerator == 0 || w.numerator == 0)
 79     {
 80         cout << "两个分子为零的分数相除没有意义" << endl;
 81         exit(0);
 82     }
 83     z.numerator = numerator * w.denominator;
 84     z.denominator = denominator * w.numerator;
 85     return z;
 86 }
 87 
 88 //成员函数的重载
 89 //分数 / 整数
 90 const fraction fraction::div(int k)
 91 {
 92 　 fraction z;
 93     if (numerator == 0 || k == 0)
 94     {
 95         cout << "两个分子为零的分数相除没有意义" << endl;
 96         exit(0);
 97     }
 98 z.numerator = numerator;
 99 z.denominator = k * denominator;
100 return z;
101 }
102 
103 //函数功能：使输出的分数为真分数
104 int fraction::commonden(void)
105 {
106     int m,n,p;
107     m = denominator;
108     n = numerator;
109     do
110     {
111         p = m % n;
112         m = n;
113         n = p;
114     }while(p != 0);
115     return m;
116 }
117 
118 void fraction::show(void)
119 {
120     if (numerator == 0)
121     {
122         cout << " = 0" << endl;
123     }
124     else
125     {
126         if (numerator == denominator)
127         {
128             cout << " = 1" << endl;
129         }
130         else
131         {
132             cout << " = " << numerator/commonden() << "/" << denominator/commonden() << endl;
133         }
134     }
135 }
136 
137 void fraction::setn(int x)      //设定分子
138 {
139 numerator = x;
140 }
141 void fraction::setd(int y)      //设定分母
142 {
143 denominator = y;
144 }
145 int fraction::getn(void)const
146 {
147 return numerator;
148 }
149 int fraction::getd(void)const
150 {
151 return denominator;
152 }
好了，写个主函数来测试下
View Code 
void main()
{
　　fraction w(6,7),t(9,5),d;

      cout << "(6/7) + (9/5)";
      d = w.add(t);
      d.show();
      cout <<endl;

    cout << "(6/7) + 1";  //       6                  13
    d = w.add(1);           //       -    +   1   =    -
    d.show();                 //       7                   7
    cout <<endl;

    cout << "(6/7) - (9/5)";
    d = w.sub(t);
    d.show();
    cout <<endl;

    cout << "(6/7) - 1";
    d = w.sub(1);
    d.show();
    cout <<endl;

    cout << "(6/7) * (9/5)";
    d = w.mul(t);
    d.show();
    cout <<endl;

    cout << "(6/7) * 2";
    d = w.mul(2);
    d.show();
    cout <<endl;

    cout << "(6/7) / (9/5)";
    d = w.div(t);
    d.show();
    cout <<endl;

    cout << "(6/7) / 2";
    d = w.div(2);
    d.show();
    cout <<endl;
　return ;
}

来看看测试结果吧！

图片
posted @ 2011-03-08 20:29  涵曦  阅读(262)  评论(0)  编辑  收藏  举报