c语言项目 注释转换 （c———c++）

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：

所以我们把项目分成这以下四个状态：

1

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__

"CommentConvert.c"

#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;}}

“test.c”

#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;}

这样就完成了注释转换项目。