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！
