파일입출력 ㅠㅠ

//http://www.acm.uiuc.edu/webmonkeys/book/c_guide/
 
#include <windows.h>
#include <stdio.h>
 
 
void Fileoutput ();
void Fileread ();
void Showresult ();
 
 
int main () 
{
	Fileoutput ();
	Fileread ();
	Showresult ();
	system("pause");
	return 0;
}
 
 
//첫번째 함수는 파일을 열고 문자열 단위로 출력하는 겁니다
 
void Fileoutput () 
{
	char read[20];
	char* pchar = NULL;
 
	//FILE *fopen(const char *filename, const char *mode);
	//On success a pointer to the file stream is returned. On failure a null pointer is returned.
	FILE * fp = fopen ("text.txt", "rt");
	if (fp == NULL)
	{
		puts ("파일오픈 실패!");
		return ;
	}
 
	while (1)
    {
		//http://www.acm.uiuc.edu/webmonkeys/book/c_guide/2.12.html#feof
		//int feof(FILE *stream);
		//Tests the end-of-file indicator for the given stream.
		//If the stream is at the end-of-file, then it returns a nonzero value.
		//If it is not at the end of the file, then it returns zero.
		if(feof (fp) != 0)
			break;
 
		//
		memset(read, 0x00, sizeof(read));
 
		//char *fgets(char *str, int n, FILE *stream);
		//Reads a line from the specified stream and stores it into the string pointed to by str.
		//It stops when either (n-1) characters are read, the newline character is read,
		//or the end-of-file is reached, whichever comes first.
		//The newline character is copied to the string.
		//A null character is appended to the end of the string.
		//On success a pointer to the string is returned. On error a null pointer is returned.
		//If the end-of-file occurs before any characters have been read, the string remains unchanged.
		pchar = fgets (read, sizeof (read), fp);
		if (pchar == NULL)
		{
			fclose (fp);
			return ;
		}
		printf ("%s", read);
	}
	fclose (fp);
}
 
 
//두번째 함수는 파일을 복사하는 것이고요
 
void Fileread () 
{
	char read[500];
	char* pchar = NULL;
  	FILE * fp_src = fopen ("text.txt", "rt");
	FILE * fp_des = fopen ("output.txt", "wt");
 
	if (fp_src == NULL)
	{
		puts ("src 읽기 파일 열기 실패!");
		return ;
	}
	if (fp_des == NULL)
	{
		fclose (fp_src);
		puts ("des 쓰기 파일 열기 실패!");
		return ;
	}
 
	while (1)
	{
		if(feof (fp_src) != 0)
			break;
 
		//
		memset(read, 0x00, sizeof(read));
 
		//
		pchar = fgets (read, sizeof (read), fp_src);
		if (pchar == NULL)
		{
			fclose (fp_src);
			fclose (fp_des);
			return ;
		}
		fputs (read, fp_des);
		printf ("%s", read);
	}
	fclose (fp_src);
	fclose (fp_des);
}
 
 
//세번째 함수는 복사한 파일을 읽어서 문자열의 길이를 알고 그 문자열 안에서 #의 갯수를 알아내어 퍼센트 게이지를 얻는 함수입니다..
 
void Showresult () 
{
	int i			= 0;
	int len			= 0;
	int resultcnt	= 0;
	int resultnum	= 0;
	double value	= 0.0;
	double result[10];
	char read[500];
	char* pchar = NULL;
	FILE * fp = fopen ("output.txt", "rt");
	if (fp == NULL)
	{
		puts ("파일오픈 실패!");
		return ;
	}
 
	while (1)
	{
		if(feof (fp) != 0)
			break;
 
		//
		pchar = fgets (read, sizeof (read), fp);
		if (pchar == NULL)
		{
			fclose (fp);
			return ;
		}
 
		//
		for (i = 0; read[i] != NULL; i++)
		{
			if (read[i] == '#')
				resultnum++;
		}
		len = strlen (read);
		value = (double)(len - resultnum);
		if(value == 0.0)
		{
			result[resultcnt] = 0.0;
		}
		else
		{
			result[resultcnt] = value / 100.00;
		}
		resultnum = 0;
		resultcnt++;
	}
	resultcnt = 0;
 
	while (result[resultcnt] != '\0');
	{
		printf ("%d.Efficiency ratio is %.2f % \n", (resultcnt + 1), result[resultcnt]);
		resultcnt++;
	}
	fclose (fp);
}