感谢spencerzou的博文：http://blog.csdn.net/spencerzou/article/details/24255189
题目：有一个弱智的翻译程序，它接收一个文本文件作文输入源source.txt，通过查找给定的字典dictionary.txt，进行一一对应的翻译，并讲翻译结果输出到指定的文件out.txt。对于输入的内容，如果在字典中能找到对应的翻译，则输出翻译后的词条，否则原样输出。
字典存储为一个文本文件，每一行表示一个词条，源词条和翻译之间用逗号分隔，例如，如果有下面这个字典：
hello，你好
world，世界
当输入“hello world！”，翻译器输出“你好 世界！”，当输入“hello Blog！”，则·输出“你好 Blog！”。
1.实现这样子一个翻译程序，读入待翻译的文件和词典文件，输出翻译结果到out.txt文件中
2.要求字典的条目不限于单词（word），还可以是短语（phrase），
例如字典：
come，来
come out，出现
out，外面的
当输入的源文档中有“come out”时，应翻译为“出现”，而不是“来，外面的”
完成的类代码如下：
1: #include "mindry_buffer.h"
2: #include <iostream>
3: using namespace std;
4:
5: int main(int argc, char * argv[])
6: {
7: CMindryBuffer * mindrybuffer = new CMindryBuffer(100);
8: char * datachar = new char[40];
9: char * reschar = new char[20];
10:
11: int res = 0;
12: int res0 = 0;
13:
14: for(int i=0; i < 40; ++i)
15: {
16: datachar[i] = i + 1;
17: }
18:
19: res = mindrybuffer->Write(datachar, 40);
20: printf("write total:%d
", res);
21: res = mindrybuffer->Write(datachar, 40);
22: printf("write total:%d
", res);
23: res = mindrybuffer->Write(datachar, 40);
24: printf("write total:%d
", res);
25: res = mindrybuffer->Write(datachar, 40);
26: printf("write total:%d
", res);
27:
28: res0 = mindrybuffer->Read(reschar, 20);
29: printf("read total:%d
", res0);
30:
31: res = mindrybuffer->Write(datachar, 40);
32: printf("write total:%d
", res);
33: res = mindrybuffer->Write(datachar, 40);
34: printf("write total:%d
", res);
35: res = mindrybuffer->Write(datachar, 40);
36: printf("write total:%d
", res);
37:
38: for(int j=0; j < 20; ++j)
39: {
40: if(j % 10 == 0) cout<<endl;
41: printf("%d ",reschar[j]);
42: }
43: return 0;
44: }
1: //mindry_buffer.h
2:
3: #ifndef MINDRY_BUFFER_H_H
4: #define MINDRY_BUFFER_H_H
5:
6: class CMindryBuffer
7: {
8: public:
9: bool isFull();//缓冲区是否满
10: bool isEmpty();//缓冲区是否空
11: void Empty();//置空缓冲区
12: int GetLength();//缓冲区大小
13:
14: CMindryBuffer(int size);
15: virtual ~CMindryBuffer();
16:
17: int Write(char * buf, int count);//写缓冲
18: int Read(char * buf, int count);//读缓冲
19:
20: private:
21: bool m_bEmpty;//缓冲区空标识
22: bool m_bFull;//缓冲区满标识
23:
24: char * m_pBuf;//缓冲区指针
25: int m_nBufSize;//缓冲区大小
26: int m_nReadPos;//读数据位置
27: int m_nWritePos;//写数据位置
28:
29: };
30:
31: #endif
1: #include "mindry_buffer.h"
2: #include <cstring>
3:
4: CMindryBuffer::CMindryBuffer(int size)
5: {
6: m_nBufSize = size;
7: m_nReadPos = 0;
8: m_nWritePos = 0;
9: m_pBuf = new char[m_nBufSize];
10: m_bEmpty = true;
11: m_bFull = false;
12: }
13:
14: CMindryBuffer::~CMindryBuffer()
15: {
16: delete[] m_pBuf;
17: }
18:
19: int CMindryBuffer::Write(char *buf, int count)
20: {
21: if(count <= 0) return 0;
22:
23: m_bEmpty = false;//buffer is full
24:
25: if(m_bFull)
26: {
27: return 0;
28: }
29: else if(m_nReadPos == m_nWritePos) //buffer is empty
30: {
31: /*
32: empty m_nReadPos empty
33: |-------------------------|---------------------------| m_nBufSize
34: m_nWritePos
35: */
36: int rightcount = m_nBufSize - m_nWritePos;
37: if(rightcount > count)//space is enough
38: {
39: memcpy(m_pBuf + m_nWritePos, buf, count);
40: m_nWritePos += count;
41: m_bFull = (m_nWritePos == m_nReadPos);
42: return count;
43: }
44: else
45: {
46: memcpy(m_pBuf + m_nWritePos, buf, rightcount);
47: m_nWritePos = (m_nReadPos > count - rightcount) ?
48: count - rightcount : m_nWritePos;//is left space enough?yes,copy;no, no action;
49: memcpy(m_pBuf, buf + rightcount, m_nWritePos);
50: m_bFull = (m_nWritePos == m_nReadPos);
51: return rightcount + m_nWritePos;
52: }
53: }
54:
55: /*
56: empty m_nReadPos m_nWritePos empty
57: |-----------------|------------------|-------------------| m_nBufSize
58: data rightcount
59: */
60: else if(m_nReadPos < m_nWritePos)//buffer is not full
61: {
62: int rightcount = m_nBufSize - m_nWritePos;
63: if(rightcount > count) //rest space is enough
64: {
65: memcpy(m_pBuf + m_nWritePos, buf, count);
66: m_nWritePos += count;
67: m_bFull = (m_nReadPos == m_nWritePos);
68: return count;
69: }
70: else//rest space is not enough
71: {
72: memcpy(m_pBuf + m_nWritePos, buf, rightcount);
73: m_nWritePos = (m_nReadPos > count - rightcount) ?
74: count - rightcount : m_nReadPos;
75: memcpy(m_pBuf, buf + rightcount, m_nWritePos);
76: m_bFull = (m_nWritePos == m_nReadPos);
77: return rightcount + m_nWritePos;
78: }
79: }
80: }
81:
82: int CMindryBuffer::Read(char *buf, int count)
83: {
84: if(count < 0) return 0;
85:
86: m_bFull = false;
87: if(m_bEmpty)
88: {
89: return 0;
90: }
91: else if(m_nReadPos == m_nWritePos) //buffer is full
92: {
93: /*
94: data m_nReadPos data
95: |--------------------|--------------------|m_nBufSize
96: m_nWritePos rightcount
97: */
98: int rightcount = m_nBufSize - m_nReadPos;
99: if(rightcount > count)
100: {
101: memcpy(buf, m_pBuf + m_nReadPos, count);
102: m_nReadPos += count;
103: m_bEmpty = (m_nReadPos == m_nWritePos);
104: return count;
105: }
106: else
107: {
108: memcpy(buf, m_pBuf + m_nReadPos, rightcount);
109: m_nReadPos = (m_nWritePos >= count - rightcount) ?
110: count - rightcount : m_nWritePos;
111: memcpy(buf + rightcount, m_pBuf, m_nReadPos);
112: m_bEmpty = (m_nReadPos == m_nWritePos);
113: return rightcount + m_nReadPos;
114: }
115:
116: }
117: else if(m_nReadPos < m_nWritePos)
118: {
119: /*
120: m_nReadPos data m_nWritePos
121: |-----------------|----------------|-----------------|m_nBufSize
122:
123: */
124: int rightcount = m_nWritePos - m_nReadPos;
125:
126: int temp = (rightcount > count) ? count : rightcount;
127: memcpy(buf, m_pBuf + m_nReadPos, temp);
128: m_nReadPos += temp;
129: m_bEmpty = (m_nWritePos == m_nReadPos);
130: return temp;
131: }
132: else if(m_nReadPos > m_nWritePos)
133: {
134: /*
135: data m_nWritePos m_nReadPos data m_nBufSize
136: |------------------|------------------|--------------------|
137:
138: */
139: int rightcount = m_nBufSize - m_nReadPos;
140:
141: if(rightcount > count)
142: {
143: memcpy(buf, m_pBuf + m_nReadPos, count);
144: m_nReadPos += count;
145: m_bEmpty = (m_nWritePos == m_nReadPos);
146: return count;
147: }
148: else
149: {
150: memcpy(buf, m_pBuf + m_nReadPos, rightcount);
151: m_nReadPos = (m_nWritePos > count - rightcount) ?
152: count - rightcount : m_nWritePos;
153: memcpy(buf, m_pBuf, m_nReadPos);
154: m_bEmpty = (m_nWritePos == m_nReadPos);
155: return rightcount + m_nReadPos;
156: }
157: }
158: }
159:
160:
161: int CMindryBuffer::GetLength()
162: {
163: if(m_bEmpty)
164: {
165: return 0;
166: }
167: if(m_bFull)
168: {
169: return m_nBufSize;
170: }
171: if(m_nReadPos < m_nWritePos)
172: {
173: return m_nReadPos - m_nWritePos;
174: }
175: else
176: {
177: return m_nBufSize - (m_nReadPos - m_nWritePos);
178: }
179: }
180:
181:
182: void CMindryBuffer::Empty()
183: {
184: m_nReadPos = 0;
185: m_nWritePos =0;
186: m_bEmpty = true;
187: m_bFull = false;
188: }
189:
190: bool CMindryBuffer::isEmpty()
191: {
192: return m_bEmpty;
193: }
194:
195: bool CMindryBuffer::isFull()
196: {
197: return m_bFull;
198: }
存在问题：类的封装和方法划分不很合适，值得进一步改进。