c注释风格转化到c++注释风格

// 1.一般情况
int num = 0;
/* int i = 0; */

// 2.换行问题
/* int i = 0; */int j = 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
/**//**/

// 6.连续的**/问题
/***/

// 7.C++注释问题
// /*xxxxxxxxxxxx*/

#pragma once

#include <stdio.h>
#include <stdlib.h>

typedef enum Convert_State//定义状态
{
NULL_STATE,
C_STATE,
CPP_STATE,
END_STATE
}StateType;

void CommentConvert();
void DoConvertWork(FILE *read, FILE *write);
void Null_Convert(FILE *read, FILE *write);
void C_Convert(FILE *read, FILE *write);
void Cpp_Convert(FILE *read, FILE *write);

#define _CRT_SECURE_NO_WARNINGS 1
#include "CommentConvert.h"

StateType state;//state定义为全局变量

void CommentConvert()
{
FILE *pwrite = NULL;
FILE *pread = fopen("input.c", "r");

if(pread == NULL)
{
perror("open file for read");
exit(EXIT_FAILURE);
}

pwrite = fopen("output.c", "w");

if(pwrite == NULL)
{
fclose(pread);
perror("open file for write");
exit(EXIT_FAILURE);
}

DoConvertWork(pread, pwrite);
fclose(pread);
fclose(pwrite);
}

void DoConvertWork(FILE *read, FILE *write)
{
state = NULL_STATE;//初值赋为无状态
while(state != END_STATE)
{
switch(state)
{
case NULL_STATE:
Null_Convert(read, write);
break;
case C_STATE:
C_Convert(read, write);
break;
case CPP_STATE:
Cpp_Convert(read, write);
break;
default:
break;
}
}
}

void Null_Convert(FILE *read, FILE *write)
{
int first = fgetc(read);
int second = 0;

switch(first)
{
case '/':
{
second = fgetc(read);

if(second == '*')
{
fputc(first, write);
fputc('/', write);
state = C_STATE;
}
else if(second == '/')
{
fputc(first, write);
fputc(second, write);
state = CPP_STATE;
}
else
{
fputc(first, write);
fputc(second, write);
}
}
break;
case EOF:
fputc(first, write);
state = END_STATE;
break;
default:
fputc(first, write);
break;
}
}

void C_Convert(FILE *read, FILE *write)
{
int first = fgetc(read);
int second = 0;
int third = 0;

switch(first)
{
case '\n':
fputc('\n', write);
fputc('/', write);
fputc('/', write);
break;
case '*':
{
second = fgetc(read);
if(second == '/')
{
third = fgetc(read);
if(third == '\n')
{
fputc('\n', write);
}
else
{
fputc('\n', write);
ungetc(third, read);//在c注释风格最后判断为非\n要
}
state = NULL_STATE;
}
else if(second == '*')
{
fputc(first, write);
ungetc(second, read);//把读取到的'*'字符退回到输入流中
}
else
{
fputc(first, write);
}
}
break;
default:
fputc(first, write);
break;
}
}
void Cpp_Convert(FILE *read, FILE *write)
{
int first = fgetc(read);
int second = 0;

switch(first)
{
case '\n':
fputc(first, write);
state = NULL_STATE;
break;
case EOF:
fputc(first, write);
state = END_STATE;
break;
default:
fputc(first, write);
break;
}
}

#include "CommentConvert.h"

int main()
{
CommentConvert();
system("pause");
return 0;
}

// 1.一般情况
int num = 0;
// int i = 0;

// 2.换行问题
// int i = 0;
int j = 0;
// int i = 0;
int j = 0;

// 3.匹配问题
//int i = 0;/*xxxx

// 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
//
//

// 6.连续的**/问题
//*

// 7.C++注释问题
// /*xxxxxxxxxxxx*/