scaner.cpp

扫描器程序

#include "stdafx.h"
#include <iostream>
using namespace std;
#include <stdlib.h>

int main()
{
	FILE *fp1,*fp2;
	if ((fp1=fopen("scaner.cpp","r"))==NULL)
	{
		cout<<"Cannot open the file source.txt!"<<endl;
		exit(1);
	}

	if ((fp2=fopen("result.txt","w"))==NULL)
	{
		cout<<"Cannot open the file result.txt!"<<endl;
		exit(1);
	}
	
	char ch,temp;

	
	while(ch!=EOF){
		switch(ch)
		{
			case' ' :
			case'\n':
			case'\t':
				ch=fgetc(fp1);
				break;
			case'/':
				temp=ch;
				ch=fgetc(fp1);
				if (ch=='/')
				{
					ch=fgetc(fp1);
					while(ch!='\n'&&ch!=EOF)
						ch=fgetc(fp1);
					if (ch==EOF)
						exit(0);
				}
				else if (ch=='*')
				{
					ch=fgetc(fp1);
					while (1)
					{
						if (ch==EOF)
						{
							cout<<"error\n";
							exit(1);
						}
						while(ch!='*')
						{
							ch=fgetc(fp1);
							break;
						}
					}
				}
				else
				{
					fputc(ch,fp2);
					cout<<ch;
				}
				break;
			default:
				cout<<ch;
				fputc(ch,fp2);
				ch=fgetc(fp1);
				fclose(fp2);
				
		}
	}
	system("pause");
	return 0;
}