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c语言项目—注释转换（c——c++）

2016-05-26 09:19 465 查看

题目要求：要将全部的c语言风格的注释转换为c++风格的注释，如下图所示，需要将input.c文件经过注释转换程序转换为output.c文件所示。这是测试结果：

首先我们来分析一下这个题目，在做这个项目时，我们需要引进有限状态机这个概念。那我们先来了解一下什么是有限状态机。有限状态机FSM是软件上一种常用的处理方法，他把复杂的控制逻辑分成有限个稳定状态，在每个状态上进行处理。
我们来画一下状态图：

所以我们把这个项目分成这几个状态。

NUL_STATE， C_STATE,  CPP_STATE,  EMD_STATE

现在我们来实现一下这个项目。"CommentConvert.h"

#ifndef  __COMMENT_CONVERT_H__
#define  __COMMENT_CONVERT_H__
#include<stdio.h>
#include<stdlib.h>
#define INPUTFILENAME "input.c"
#define OUTPUTFILENAME "output.c"
enum STATE
{
NUL_STATE,
C_STATE,
CPP_STATE,
EMD_STATE
};
void CommentConvert(FILE *pRead,FILE *pWrite);
void do_nul_state(FILE *pRead,FILE *pWrite);
void do_c_state(FILE *pRead,FILE *pWrite);
void do_cpp_state(FILE *pRead,FILE *pWrite);
#endif //__COMMENT_CONVERT_H__

[b]"CommentConvert.c"[/b]

#include"CommentConvert.h"
enum STATE state;
void CommentConvert(FILE *pRead,FILE *pWrite)
{
while(state!=EMD_STATE)
{
switch(state)
{
case NUL_STATE:
do_nul_state(pRead,pWrite);
break;
case C_STATE:
do_c_state(pRead,pWrite);
break;
case CPP_STATE:
do_cpp_state(pRead,pWrite);
break;
case EMD_STATE:
break;
}
}
}
void do_nul_state(FILE *pRead,FILE *pWrite)
{
int first=0;
int second=0;
first = fgetc(pRead);
switch(first)
{
case '/':
{
second=fgetc(pRead);
if(second=='*')
{
fputc('/',pWrite);
fputc('/',pWrite);
state=C_STATE;
}
else if(second=='/')
{
fputc(first,pWrite);
fputc(second,pWrite);
state=CPP_STATE;
}
else
{
fputc(first,pWrite);
fputc(second,pWrite);
}
}
break;
case EOF:
state=EMD_STATE;
break;
default:
fputc(first,pWrite);
break;
}
}
void do_c_state(FILE *pRead,FILE *pWrite)
{
int first=0;
int second=0;
int third=0;
first = fgetc(pRead);
switch(first)
{
case '*':
{
second=fgetc(pRead);
switch(second)
{
case '/':
third=fgetc(pRead);
if(third!='\n')
{
fputc('\n',pWrite);
//fputc('/',pWrite);
//fputc('/',pWrite);
state=CPP_STATE;
}
if(third=='/')
{
ungetc(third,pRead);
state=NUL_STATE;
break;
}
else
{
fputc(third,pWrite);
state=NUL_STATE;
break;
}
case'*':
third=fgetc(pRead);
fputc(first,pWrite);
if(third=='/')
{
state=NUL_STATE;
}
break;
default:
fputc(first,pWrite);
fputc(second,pWrite);
break;
}
break;
case'\n':
fputc(first,pWrite);
fputc('/',pWrite);
fputc('/',pWrite);
break;
case EOF:
state=EMD_STATE;
break;
default:
fputc(first,pWrite);
break;
}
}
}
void do_cpp_state(FILE *pRead,FILE *pWrite)
{
int first=0;
first = fgetc(pRead);
switch(first)
{
case '\n':
{
fputc(first,pWrite);
//fputc('/',pWrite);
//fputc('/',pWrite);
state=NUL_STATE;
}
break;
case EOF:
state=EMD_STATE;
break;
default:
fputc(first,pWrite);
break;
}
}

[b]“test.c”[/b]

#include"CommentConvert.h"
int main()
{
FILE *pRead = NULL;
FILE *pWrite = NULL;
printf("注释转换开始：");
pRead=fopen(INPUTFILENAME,"r");
if(NULL ==pRead)
{
perror("open file for read\n");
exit(EXIT_FAILURE);
}
pWrite=fopen(OUTPUTFILENAME,"w");
if(NULL ==pWrite)
{
fclose(pRead);
perror("open file for write\n");
exit(EXIT_FAILURE);
}
CommentConvert(pRead,pWrite);
printf("注释转换完成：");
return 0;
}

[b]这样就完成了注释转换项目。
[/b]

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标签： c语言 include 测试结果

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