注释转换项目（c->c++）_c++中c>='o'是什么意思-优快云博客

本文介绍了一个简单的程序，用于将C语言源代码文件中的C风格注释转换为C++风格注释。该程序读取名为input.c的文件，并生成output.c，其中所有的/*...*/形式的注释被转换为//...形式。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

这是头文件：
CommentConvert.h

#ifndef __Comment_Convet_H__
#define __Comment_Convet_H__

#define _CRT_SECURE_NO_WARNINGS 1

#include<stdio.h>


#include<stdlib.h>

typedef enum CONVERT_STATE
{
    NULL_STATE,
    C_STATE,
    CPP_STATE,
    END_STATE,
}StateType;

#define INPUTFILENAME "input.c"
#define OUTPUTFILENAME "output.c"

void CommentConvert();

void ConvertWork(FILE *read, FILE *write);

void Handle_NULL_STATE(FILE *read, FILE *write);
void Handle_C_STATE(FILE *read, FILE *write);
void Handle_CPP_STATE(FILE *read, FILE *write);
void Handle_END_STATE(FILE *read, FILE *write);

#endif __Comment_Convet_H__

CommentConvert.c

#include "CommentConvert.h"

StateType state;

void Handle_NULL_STATE(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:
        state = END_STATE;
        break;
    default:
        fputc(first, write);
        break;
    }
}

void Handle_C_STATE(FILE *read, FILE *write)
{
    int first = fgetc(read);
    int second = 0;
    int third = 0;
    switch (first)
    {
    case '*':
        second = fgetc(read);
        if (second == '/')// 舍弃“*/”
        {
            third = fgetc(read);
            if (third != '\n')
            {
                fputc('\n', write);
                state = NULL_STATE;
                ungetc(third, read);
            }
            else
            {
                ungetc(third, read);
                state = NULL_STATE;
            }
        }
        else
        {
            fputc(first, write);
            ungetc(second, read);
        }
        break;
    case '\n':
        fputc(first, write);
        fputc('/', write);
        fputc('/', write);
        break;
    case EOF:
        state = END_STATE;
        break;
    default:
        fputc(first, write);
        break;
    }
}


void Handle_CPP_STATE(FILE *read, FILE *write)
{
    int first = fgetc(read);
    switch (first)
    {
    case'\n':
        fputc('\n', write);
        state = NULL_STATE;
        break;
    case EOF:
        fputc(first, write);
        state = END_STATE;
        break;
    default:
        fputc(first, write);
        break;
    }
}


void Handle_END_STATE(FILE *read, FILE *write)
{
    ;
}




void ConvertWork(FILE *read, FILE *write)
{
    state = NULL_STATE;
    while (state != END_STATE)
    {
        switch (state)
        {
        case  NULL_STATE:
            Handle_NULL_STATE(read, write);
            break;
        case  C_STATE:
            Handle_C_STATE(read, write);
            break;
        case  CPP_STATE:
            Handle_CPP_STATE(read, write);
            break;
        default:
            break;
        }

    }
}




void CommentConvert()
{
    FILE* pWrite = NULL;
    FILE* pRead = fopen(INPUTFILENAME, "r");
    if (pRead == NULL)
    {
        perror("open file to read");
        exit(EXIT_FAILURE);
    }
    pWrite = fopen(OUTPUTFILENAME, "w");
    if (pWrite == NULL)
    {
        perror("open file to write");
        exit(EXIT_FAILURE);
    }

    ConvertWork(pRead,pWrite);
    fclose(pRead);
    fclose(pWrite);
}

下面是测试部分：
test.c

#include "CommentConvert.h"

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

程序运行需要在目录下读取一个文件“input.c”
手动创建这个文件，并写入相应内容即可；
程序运行结束后，产生一个“output.c”的文件，将input.c中的c语言注释修改为c++注释。

关于项目的详细解析及其主要思路，请继续关注我的博客。