Thread: Open a file, read it, display it and process char.

Hello,

I am trying to open a file, read the file,display the characters on the screen and process the data for stats.

I am able to open the file, read the file and then it is either display it or just process the data.

if i remove this part ,

/* Read one line of text */
fgets( c, 100, pFile );
/* Print it to stdout */
printf( "%s", c );

line 32 and 34, i am able to process the data.

Please note - I am able to read from a text file that is in the same folder as my source code. I called the file "text.txt" and i just type some thing inside it. Make sure the letter q is included. q acts like the end of file.I have tried EOF but does not work. I don't know why. let me know if you know why.

Where is the bug?

Thanks for your help

Code:

/* SS7q3 - Programming Exercise 11-11 modified */
#include <stdio.h>
#include <ctype.h>       // for character testing 
#include <stdbool.h>     // for boolean
#define STOP 'q'     
int main(void)
{
   char c[100];               // read in character 
   char  filename[100];
   int ch;
   int n_words = 0;      // number of words
   int n_upper = 0;        // number of uppercase characters 
   int n_lower = 0;       // number of lowercase characters     
   int n_punc = 0;      // number of punctuation marks     
   int n_digit = 0;       // number of digits          
   FILE * pFile;
   bool inword = false;  // == true if c is in a word  
          
   
   printf("Enter the filename to be analyzed\n");
   gets(filename); 
   pFile = fopen(filename, "r" );

  if (!pFile)
      fprintf( stderr, "I couldn't open the file.\n" );
   
/* Programs gets stuck with the code below*/
else
{
    
     /* Read one line of text */
   fgets( c, 100, pFile );
    /* Print it to stdout */
   printf( "%s", c );
     
   while ((ch = getc(pFile)) != STOP)
   {    
        if (!isalpha(ch) && !inword)
        {
         inword = true;  // starting a new word 
         n_words++;      // count word          
        }
        if (isalpha(ch) && inword)
         inword = false; // reached end of word
         
        if (isupper(ch))
           n_upper++;
        else if (islower(ch))
           n_lower++;
        else if (ispunct(ch))
           n_punc++;
        else if (isdigit(ch))
           n_digit++;
      }
}
   
   printf("\nwords = %d, uppercase = %d,  lowercase = %d, "
          "punctuation = %d, digits = %d\n",
           n_words,n_upper,n_lower, n_punc, n_digit);
           
   fclose(pFile);        
           
      /* Pause program to view result */  
    printf("\nPress [Enter] to exit, Bye.\n\n");         
    fflush(stdin);
    getchar();   
    
   return 0;
}

If I'm understanding your complaint, once you've read that first line, you can't read it again unless you rewind the file back to the beginning.

I have no idea how you were testing end of file. You should just change STOP to EOF.

Call fgetpos() before fgets() and fsetpos() before getc() to move the file offset back by the no. of bytes read.
Alternatively, you can roll your own version of getc() which reads a character at a time from the buffer c[100].

i somehow cannot use EOF in this program. It just does not work. the end of file in my case is set once the character q is encounter.

If I take your program, change the word STOP to the word EOF, and compile it and run it, it works.

Code:

Enter the filename to be analyzed
ss7q3.c
#include <stdio.h>

words = 135, uppercase = 15, lowercase = 501, punctuation = 184, digits = 15

You would get different results because I didn't put in the comments.

I finally got it woking using the rewind function, even with the EOF.

The definition of a word here is

"a word is defined to be any string of letters or numbers not separated by spaces or punctuation. For example, "hello" and "321" are each a single word, but "555-1212" and "C1A 4P3" are each two words"

Code:

/* SS7q3 - Programming Exercise 11-11 modified */
#include <stdio.h>
#include <ctype.h>       // for character testing 
#include <stdbool.h>     // for boolean   
int main(void)
{
   char c[100];               // read in character 
   char  filename[1];
   char ch;
   int n_words = 0;           // number of words
   int n_upper = 0;           // number of uppercase characters 
   int n_lower = 0;           // number of lowercase characters     
   int n_punc = 0;            // number of punctuation marks     
   int n_digit = 0;           // number of digits          
   FILE * pFile;
   
   bool inword = false;       // == true if c is in a word  
          
   
   printf("Enter the filename to be analyzed\n");
   gets(filename); /* supplied  file is text.txt or make sure file has |*/ 
   pFile = fopen(filename, "r" );

   if (!pFile)
   fprintf( stderr, "I couldn't open the file.\n" );
   
   else
    {
        fgets( c, 100, pFile ); /* Read text */
        printf( "%s", c ); /* Print it to stdout */
    }
    
    rewind(pFile); /* Move pointer back to iniial position*/
    while ((ch = getc(pFile)) != EOF)

   {    
        if (isalpha(ch) && !(inword) )
        {
         inword = true;  // starting a new word 
         n_words++;      // count word          
        }
        if ((isspace(ch) || ispunct(ch)) && (inword))
         inword = false; // reached end of word
         
        if (isupper(ch))
           n_upper++;
        else if (islower(ch))
           n_lower++;
        else if (ispunct(ch))
           n_punc++;
        else if (isdigit(ch))
           n_digit++; 
   }
   
   printf("\nwords = %d, uppercase = %d,  lowercase = %d, "
          "punctuation = %d, digits = %d\n",
           n_words,n_upper,n_lower, n_punc, n_digit);
           
   fclose(pFile);        
           
      /* Pause program to view result */  
    printf("\nPress [Enter] to exit, Bye.\n\n");         
    fflush(stdin);
    getchar();   
    
   return 0;
}