C语言实现注释转换

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注释转换是指将input.c程序中C语言注释全部转化为C++注释,并在output.c中展现出来

可能出现的情况如下图所示

代码实现如下：

test,c

#include "Comment Covert.h"#include<stdlib.h>int main(){FILE *pfRead = NULL;FILE *pfWrite = NULL;pfRead = fopen("input.c", "r");if (NULL == pfRead){perror("open file for read");return;}pfWrite = fopen("output.c", "w");if (NULL == pfWrite){perror("open file for write");fclose(pfRead);return;}DoConvertWork(pfRead, pfWrite);fclose(pfRead);fclose(pfWrite);system("pause\n");    return 0;}

Commet Covert.h中

#define _CRT_SECURE_NO_WARNINGS 1#ifndef __COMMNT_H__#define __COMMNT_H__#include<stdio.h>enum STATE{NUL_STATE,C_STATE,CPP_STATE,END_STATE};void DoCState(FILE *pfIn, FILE *pfOut);void DoCPPState(FILE *pfIn, FILE *pfOut);void DoNulState(FILE *pfIn, FILE *pfOut);void DoConvertWork(FILE *pfIn, FILE *pfOut);#endif // __COMMNT_H__

Comment Convert.c中

#include"Comment Covert.h"static enum STATE state = NUL_STATE;void DoConvertWork(FILE *pfIn, FILE *pfOut){while (state != END_STATE){switch (state){case C_STATE:DoCState(pfIn, pfOut);break;case CPP_STATE:DoCPPState(pfIn, pfOut);break;case NUL_STATE:DoNulState(pfIn, pfOut);break;}}}void DoNulState(FILE *pfIn, FILE *pfOut){int first = fgetc(pfIn);switch (first){case '/':{int second = fgetc(pfIn);switch (second){case '*':fputc('/', pfOut);fputc('/', pfOut);state = C_STATE;//C风格开始break;case '/':fputc(first, pfOut);fputc(second, pfOut);state = CPP_STATE;//C++风格开始break;default:fputc(second, pfOut);break;}break;}case EOF:state = END_STATE;break;default:fputc(first, pfOut);}}void DoCState(FILE *pfIn, FILE *pfOut)//C转换为Cpp;  {int first = fgetc(pfIn);int second = 0;switch (first){case '*':second = fgetc(pfIn);if (second == '/')//舍弃 */；  {int third = fgetc(pfIn);state = NUL_STATE;if (third != '\n'){fputc('\n', pfOut);ungetc(third, pfIn);//ungetc函数的功能是将已读数据还回缓冲区；  }if (third == '\n'){fputc(third, pfOut);}}else{fputc(first, pfOut);ungetc(second, pfIn);//将*之后的内容还回缓冲区；  }break;case '\n'://如果是换行，那就是连续注释，就将下一行开头加入Cpp注释；  fputc(first, pfOut);fputc('/', pfOut);fputc('/',pfOut );break;case EOF:fputc(first, pfOut);state =END_STATE;break;default:fputc(first, pfOut);break;}}void DoCPPState(FILE *pfIn, FILE *pfOut){int first = fgetc(pfIn);switch (first){case '\n':fputc(first, pfOut);state = NUL_STATE;break;case EOF:state = END_STATE;default:fputc(first, pfOut);break;}}

input.c

// 1.一般情况int num = 0;/* int i = 0; */// 2.换行问题/* int i = 0; *//* int i = 0; */int j = 0;// 3.匹配问题/*int i = 0;/*xxxxx*/// 4.多行注释问题/*int i=0;int j = 0;int k = 0;*/int k = 0;// 5.连续注释问题/*a*//*b*/// 6.连续的**/问题/***/// 7.C++注释问题 /*xxxxxxxxxxxx*/

输出结果对比如下

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