注释转换

用C语言实现注释转换，将代码当中有关C语言的注释全部转换为C++注释形式。

Commentcovert.h

#ifndef __COMMENT_CONVERT_H__
#define __COMMENT_CONVERT_H__


#include 
#include 
enum STATE
{
	NUL_STATE,
	C_STATE,
	CPP_STATE,
	END_STATE
};


void DoConvertWork(FILE* pfIn, FILE* pfOut);
void DoNULState(FILE* pfIn, FILE* pfOut);
void DoCState(FILE* pfIn, FILE* pfOut);
void DoCppState(FILE* pfIn, FILE* pfOut);

#endif

test.c
#define _CRT_SECURE_NO_WARNINGS 1
#include"CommentCovert.h"

void test()
{
	FILE* pfIn = fopen("input.txt", "r");
	if (NULL == pfIn)
	{
		perror("open file for read");
		exit(EXIT_FAILURE);
	}
	FILE* pfOut = fopen("output.txt", "a");
	if (NULL == pfOut)
	{
		perror("open file for write");
		fclose(pfIn);
		exit(EXIT_FAILURE);
	}
	DoConvertWork(pfIn, pfOut);
	fclose(pfIn);
	fclose(pfOut);
}


int main()
{
	test();
	return 0;
}

Commentcovert.c
#define _CRT_SECURE_NO_WARNINGS 1
#include"CommentCovert.h"
enum STATE state = NUL_STATE;
void DoConvertWork(FILE* pfIn, FILE* pfOut)
{
	while (state != END_STATE)
	{
		switch (state)
		{
		case NUL_STATE:
			DoNULState(pfIn, pfOut);
			break;
		case C_STATE:
			DoCState(pfIn, pfOut);
			break;
		case CPP_STATE:
			DoCppState(pfIn, pfOut);
			break;
		}
	}
}
void DoNULState(FILE* pfIn, FILE* pfOut)
{
	int first=0;
	int second=0;
	first = fgetc(pfIn);
	switch (first)
	{
	case '/':
				second = fgetc(pfIn);
				if (second == '/')         // 遇到*/ 说明c的注释结束，切换到无状态 
				{
					fputc('/', pfOut);
					fputc('/', pfOut);
					state = CPP_STATE;
				}
				else if (second == '*')    // 遇到* 说明是c的注释，切换到c的注释处理
				{
					state = C_STATE;
					fputc(first, pfOut);
					fputc('/', pfOut);
				}
				else
				{
					fputc(first, pfOut);
					fputc(first, pfOut);
				}
				break;
	case EOF:
		state = END_STATE;
		break;
	default:
		fputc(first, pfOut);
		break;
	}
}

	void DoCState(FILE* pfIn, FILE* pfOut)          //C语言的注释处理
	{
		int first = 0;
		int second = 0;
		int third = 0;
		first = fgetc(pfIn);
		switch (first)
		{
		case '*':
		
				    second = fgetc(pfIn);
					if (second == '/')
					{
						state = NUL_STATE;
						third = fgetc(pfIn);
						if (third != '\n')
						{
							fputc('\n', pfOut);
							ungetc(third, pfIn);
						}
						else
						{
							ungetc(third, pfIn);
						}
					}
					else 
					{
						fputc(first, pfOut);
						ungetc(second, pfIn);
					}
					break;
		
		case '\n':
			fputc(first, pfOut);
			fputc('/', pfOut);
			fputc('/', pfOut);
			break;
		default:
			fputc(first, pfOut);
			break;
		}
	}
	void DoCppState(FILE* pfIn, FILE* pfOut)            //C++语言的注释处理
	{
		int first = fgetc(pfIn);
		switch (first)
		{
		case '\n':
			fputc(first, pfOut);
			state = NUL_STATE;
			break;
		default:
			if (first == EOF)
			{
				state = END_STATE;
			}
			else
			{
				fputc(first, pfOut);
			}
			break;
		}
	}

程序运行：

程序运行后：将代码当中有关C语言的注释全部转换为C++注释形式