C语言小项目——注释转换

青旅半醒 2022-05-23 07:36 171阅读 0赞

我们要测试几种情况，将一些.c文件里的C语言注释转换成c++语言注释。

commentconvert.h

#ifndef __COMMENTCONVERT_H__
    #define __COMMENTCONVERT_H__
    
    #include<stdio.h>
    #include<stdlib.h>
    
    enum State
    {
    	NUL_STATE,//无注释状态
    	C_STATE,//C注释状态
    	CPP_STATE,//C++注释状态
    	END_STATE //结束状态
    };
    void DoNulState(FILE *pfIn, FILE *pfOut, enum State *state);
    void DoCState(FILE *pfIn, FILE *pfOut, enum State *state);
    void DoCppState(FILE *pfIn, FILE *pfOut, enum State *state);
    void commentconvert(FILE* pfIn, FILE* pfOut);
    #endif //__COMMENTCONVERT_H__

test.c

#define _CRT_SECURE_NO_WARNINGS 1
    
    #include"commentconvert.h"
    void test()
    {
    	FILE* pfIn;
    	FILE* pfOut;
    	pfIn = fopen("Input.c", "r");
    	if (pfIn == NULL)
    	{
    		perror("the file for read");
    		exit(EXIT_FAILURE);
    	}
    	pfOut = fopen("Output.c", "w");
    	if (pfOut == NULL)
    	{
    		perror("the file for read");
    		fclose(pfIn);
    		pfIn = NULL;
    		exit(EXIT_FAILURE);
    	}
    	commentconvert(pfIn, pfOut);
    	fclose(pfOut);
    	pfOut = NULL;
    }
    int main()
    {
    	test();
    	system("pause");
    	return 0;
    }

commentconvert.c

#define _CRT_SECURE_NO_WARNINGS 1
    
    #include"commentconvert.h"
    void DoNulState(FILE *pfIn, FILE *pfOut, enum State *state)
    {
    	int first = fgetc(pfIn);
    	switch (first)
    	{
    	case '/':
    	{
    				int second = fgetc(pfIn);
    				switch (second)
    				{
    				case '*':
    				{
    							fputc('/', pfOut);
    							fputc('/', pfOut);
    							*state = C_STATE;
    				}
    					break;
    				case '/':
    				{
    							fputc(first, pfOut);
    							fputc(second, pfOut);
    							*state = CPP_STATE;
    				}
    					break;
    				case EOF:
    				{
    							fputc(first, pfOut);
    							*state = END_STATE;
    				}
    					break;
    				default:
    				{
    						   fputc(first, pfOut);
    						   fputc(second, pfOut);
    				}
    					break;
    				}
    	}
    		break;
    	case EOF:
    		*state = END_STATE;
    		break;
    	default:
    		fputc(first, pfOut);
    		break;
    	}
    }
    void DoCState(FILE *pfIn, FILE *pfOut, enum State *state)
    {
    	int first = fgetc(pfIn);
    	switch (first)
    	{
    	case '*':
    	{
    				int second = fgetc(pfIn);
    				switch (second)
    				{
    				case '/':
    				{
    							int third = fgetc(pfIn);
    							switch (third)
    							{
    							case '\n':
    								fputc('\n', pfOut);
    								*state = NUL_STATE;
    								break;
    							case '/':
    								fputc(first, pfOut);
    								fputc(second, pfOut);
    								fputc(third, pfOut);
    								*state = C_STATE;
    								break;
    							default:
    								fputc('\n', pfOut);
    								fputc(third, pfOut);
    								*state = NUL_STATE;
    								break;
    							}
    				}
    					//fputc('\n', pfOut);
    					//*state = NUL_STATE;
    					break;
    				default:
    					fputc(first, pfOut);
    					ungetc(second, pfIn);
    					break;
    				}
    	}
    		break;
    	case '\n':
    	{
    				 fputc('\n', pfOut);
    				 fputc('/', pfOut);
    				 fputc('/', pfOut);
    				 *state = C_STATE;
    	}
    		break;
    	case EOF:
    		*state = END_STATE;
    		break;
    	default:
    		fputc(first, pfOut);
    		break;
    	}
    }
    void DoCppState(FILE *pfIn, FILE *pfOut, enum State *state)
    {
    	int first = fgetc(pfIn);
    	switch (first)
    	{
    	case '\n':
    	{
    				fputc('\n', pfOut);
    				*state = NUL_STATE;
    	}
    		break;
    	case EOF:
    		*state = END_STATE;
    		break;
    	default:
    		fputc(first, pfOut);
    		break;
    	}
    }
    void commentconvert(FILE* pfIn, FILE* pfOut)
    {
    	enum State state=NUL_STATE;
    	while (state != END_STATE)
    	{
    		switch (state)
    		{
    		case NUL_STATE:
    			DoNulState(pfIn, pfOut, &state);
    			break;
    		case C_STATE:
    			DoCState(pfIn, pfOut, &state);
    			break;
    		case CPP_STATE:
    			DoCppState(pfIn, pfOut, &state);
    			break;
    		default:
    
    			break;
    		}
    	}
    }

以下是此代码测试的几种情况：

![70][]

[70]: /images/20220523/74ad83879a294265a479bc5ec1dde5fd.png