c语言项目-注释转换

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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

分析：

从input.c文件可以看书，每行开头遇见的内容有三种 // , /* ,其他代码。因此，这里就要分情况讨论。可以定义三个函数，分别处理NULL，C，C++对应状态。将 // 定义为CPP_STATE, /* 定义为 C_STATE状态，其他情况定义为NULL_STATE。下图给出了三者的转换关系：

应当注意的是：在C_STATE状态转换下，遇到*/后还应该考虑后边是否还有其他代码，以及在遇到 */之前会出现这种情况：*****/，还有遇到多行注释的情况（应该在每行开始加上 //）

具体代码如下：

"CommentCovert.h"

#ifndef _COMMENT_CONVERT_H__#define _COMMENT_CONVERT_H__#include<stdio.h>#include<stdlib.h>#define INPUTNAME "input.c"#define OUTPUTNAME "ouput.c"enum STATE{NUL_STATE,C_STATE,CPP_STATE,END_STATE};void CommentConvert(FILE *pfRead,FILE *pfWrite);void Do_NUL_State(FILE *pfRead,FILE *pfWrite);void Do_C_State(FILE *pfRead,FILE *pfWrite);void Do_Cpp_State(FILE *pfRead,FILE *pfWrite);#endif // _COMMENT_CONVERT_H__

"CommentConert.c"

#define _CRT_SECURE_NO_WARNINGS#include"CommentConvert.h"enum STATE state = NUL_STATE;void Do_NUL_State(FILE *pfRead,FILE *pfWrite)      //遇到NULL状态下的处理{int first = 0;int second = 0;first = fgetc(pfRead);switch(first){case '/':{second = fgetc(pfRead);if(second == '*')            //NULL状态下遇到/*时将其置为//并进入C状态{fputc('/',pfWrite);fputc('/',pfWrite);state = C_STATE;}else if(second == '/')       //NULL状态下遇到//时直接输出{fputc(first,pfWrite);fputc(second,pfWrite);state = CPP_STATE;}else                         //NULL状态下遇到/后又遇到其他字符将其直接输出{fputc(first,pfWrite);fputc(second,pfWrite);}}break;case EOF:state = END_STATE;default :fputc(first,pfWrite);break;}}void Do_Cpp_State(FILE *pfRead,FILE *pfWrite)      //C++状态下的处理{int first = 0;first = fgetc(pfRead);switch(first){case '\n':                   //CPP状态下遇到'\n'，说明前一行注释已完成fputc(first,pfWrite);state = NUL_STATE;break;case EOF:state = END_STATE;break;default:fputc(first,pfWrite);break;}}void Do_C_State(FILE *pfRead,FILE *pfWrite)        //C状态下的处理{int first = fgetc(pfRead);int second = 0;int third = 0;switch(first){case '*':{ second = fgetc(pfRead);if(second == '/')       //匹配问题{ third = fgetc(pfRead);//多行注释与连续注释问题if (third != '\n')                           {                             fputc('\n', pfWrite);     ungetc(third, pfRead);                  }  else                                         {                             fputc('\n', pfWrite);                 } state = NUL_STATE;   //如果'*/'之后不是'\n'，说明在second之后还有字符，因此在此处输入一个换行，并将//读到的third字符返回到pfRead中去，并将状态置为 NUL_STATE//如果是'\n'，说明c语言注释已完，下一个字符有可是‘/’也有可能是其他字符，因此//将状态回到 NUL_STATE}else if(second == '*')   //连续的**/问题{third = fgetc(pfRead);fputc(first,pfWrite);if(third == '/')state = NUL_STATE;}else{fputc(first,pfWrite);fputc(second,pfWrite);}}break;case '\n':fputc(first,pfWrite);fputc('/',pfWrite);fputc('/',pfWrite);break;case EOF:state = END_STATE;break;default:fputc(first,pfWrite);break;}}void CommentConvert(FILE *pfRead,FILE *pfWrite){while(state != END_STATE){switch(state){case NUL_STATE:Do_NUL_State(pfRead,pfWrite);break;case C_STATE:Do_C_State(pfRead,pfWrite);break;case CPP_STATE:Do_Cpp_State(pfRead,pfWrite);break;case END_STATE:break;default:break;}}}

"test.c"

#define _CRT_SECURE_NO_WARNINGS#include"CommentConvert.h"int main(){FILE *pfRead = NULL;FILE *pfWrite = NULL;printf("转换开始\n");pfRead = fopen(INPUTNAME,"r");if(pfRead == NULL){perror("open file for read");exit(0);}pfWrite = fopen(OUTPUTNAME,"w");if(pfWrite == NULL){fclose(pfRead);perror("open file for write");exit(0);}CommentConvert(pfRead,pfWrite);printf("转换结束\n");system("pause");return 0;}

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