一个可以统计文章中出现字符频率的小程序

The J2SE(TM) Runtime Environment (JRE) is intended for software developers
and vendors to redistribute with their applications.

The J2SE Runtime Environment contains the Java virtual machine,
runtime class libraries, and Java application launcher that are
necessary to run programs written in the Java programming language.
It is not a development environment and does not contain development
tools such as compilers or debuggers.  For development tools, see the
J2SE Development Kit.
这篇文章是JDK的文档部分，本段代码实现对文章中出现的字符进行统计。

你需要两个文件

data.dat:

The J2SE(TM) Runtime Environment (JRE) is intended for software developers and vendors to redistribute with their applications. The J2SE Runtime Environment contains the Java virtual machine, runtime class libraries, and Java application launcher that are necessary to run programs written in the Java programming language. It is not a development environment and does not contain development tools such as compilers or debuggers. For development tools, see the J2SE Development Kit. 

inita.dat:

abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ(),. 

一下是代码：

//C++file.cpp /*为实现统计字符 给定字符集G{大小写字母∪( ) , . 和space}共26*2+5=57种字符 先用标准字符集给G赋初值 将待统计的文章放入article中,用*号标识文章结尾 统计时用标准字符集与待统计字母集比对相等时 */ #include <fstream> #include <iostream> #define MAX_CHARS_NUM 58 #define MAX_ROW 100 #define MAX_COL 100 using namespace std; char chars[MAX_CHARS_NUM];//存储文章中出现的字符，字符集 char article[MAX_ROW][MAX_COL];//存储待统计文章 int frequence[MAX_CHARS_NUM] = {0};//各字符出现的频度，为计算字符概率 double probty[MAX_CHARS_NUM];//各字符出现的概率 void initchars(ifstream &_fin) { for(int i = 0; i < MAX_CHARS_NUM; i++) _fin.get(chars[i]); } void show(char *ch) { for(int i = 0; i < MAX_CHARS_NUM; i++) cout << ch[i]; cout << endl; } void show(char *ch, int *fre) { for(int i = 0; i <MAX_CHARS_NUM; i++) cout << ch[i] << "/t" << fre[i] << endl; } void show(char (*art)[MAX_COL]) { for (int i = 0; i < MAX_ROW; i++) { for (int j = 0; j < MAX_COL; j++) { cout << art[i][j]; if(art[i][j] == '*')break;//遇到文章结尾 } if(art[i][j] == '*')break;//遇到文章结尾 } cout << endl; } void initart(ifstream &_fin) { char ch; for(int i = 0; i < MAX_ROW; i++) { for(int j = 0; j < MAX_COL; j++) { _fin.get(ch); article[i][j] = ch; } } } void statistic(char (*art)[MAX_COL], char *ch) { for(int k = 0; k < MAX_CHARS_NUM; k++) { for (int i = 0; i < MAX_ROW; i++) { for (int j = 0; j < MAX_COL; j++) { if(art[i][j] == ch[k]) frequence[k]++; if(art[i][j] == '*')break;//遇到文章结尾 } if(art[i][j] == '*')break;//遇到文章结尾 } } } void main() { ifstream fin; fin.open("initdata.dat"); initchars(fin); cout << "The Standard Character Set: " << endl; show(chars); fin.close(); ifstream _fin; _fin.open("data.dat"); initart(_fin); cout << "The article is : " << endl; show(article); statistic(article,chars); cout << "The frequence is: " << endl; show(chars,frequence); }