Thread: Help with fscaf() to getc() and fprintf() to putc()

This looks like the original code. Where is the code you made when trying to change it, that produces the errors?

Code:

#include <stdio.h>

int main()
{
   FILE *afile, *anotherfile;
   int number;

   afile=fopen("fun-with-numbers.txt","r");
   anotherfile=fopen("more-fun-with-numbers.txt","w");

   if (afile==NULL)
   {
      printf("Could not open file for reading.\n");
   }
   else
   {
      fprintf(stdout,"Success opening file.\n\n");
      getc(afile,"%d", &number);
      while (feof(afile)==0)
      {
         printf("%d\n", number);
         putc(anotherfile,"%d\n", number);
         getc(afile,"%d", &number);
      }
      /* do not pass a NULL pointer to fclose() */
      fclose(afile);
   }
   return 0;
}

Mindlessly replacing fprintf with putc and fscanf with getc is quite idiotic. The functions are quite different. Do you understand what putc and getc do? If not, refer to whatever reference you're studying from.

the below is still throwing errors.

Code:

#include <stdio.h>

int main()
{
   FILE *afile, *anotherfile;
   int number;
   int putc( char ch, FILE *fptr );
   int getc( FILE *fptr );

   afile=fopen("fun-with-numbers.txt","r");
   anotherfile=fopen("more-fun-with-numbers.txt","w");

   if (afile==NULL)
   {
      printf("Could not open file for reading.\n");
   }
   else
   {
      fprintf(stdout,"Success opening file.\n\n");
      getc(afile,"%d", &number);
      while (feof(afile)==0)
      {
         printf("%d\n", number);
         putc(anotherfile,"%d\n", number);
         getc(afile,"%d", &number);
      }
      /* do not pass a NULL pointer to fclose() */
      fclose(afile);
   }
   return 0;
}

You don't want to put the function prototypes in your code, they're standard functions, they are prototyped in stdio.h

putc takes a char and a FILE *.
getc takes a FILE *.

Yet int your code, you are treating putc and getc still like fprintf and fscanf.

Will you please show me an example on how to incorporate getc and putc. All I can think of is how i presented it, similar to scanf and printf. I am referring to a text that dosen't show a good example, and need some help figuring this out.

thanks,

Well, getc reads in one character a time:

Code:

int ch;
ch =  getc(input_filehandle);

And putc writes out one character a time:

Code:

putc(ch, output_filehandle);

Both functions return EOF on error.

So, in the original code, you are using fscanf and fprintf to read an integer value at a time, and write it out. In your new code, you will be using fgetc and fputc to read a character at a time, and write it out.

hmm, check what I did. Is this any closer?

Code:

#include <stdio.h>

int main()
{
   FILE *afile, *anotherfile;
   int number;
   int ch;
   ch =  getc(input_filehandle);
   putc(ch, output_filehandle);

   afile=fopen("fun-with-numbers.txt","r");
   anotherfile=fopen("more-fun-with-numbers.txt","w");

   if (afile==NULL)
   {
      printf("Could not open file for reading.\n");
   }
   else
   {
      fprintf(stdout,"Success opening file.\n\n");
      getc(afile,"%d", &number);
      while (feof(afile)==0)
      {
         printf("%d\n", number);
         putc(anotherfile,"%d\n", number);
         getc(afile,"%d", &number);
      }
      /* do not pass a NULL pointer to fclose() */
      fclose(afile);
   }
   return 0;
}

thank you

You are just parroting whatever examples I give and inserting them into your code, without actually understand what you're doing, or what the code is doing.

I'm not going to spoonfeed the solution to you, think for yourself.

Well my fault, I assumed this was a help message board, one that helps one in need. Not a board where people say "nope, thats wrong" and give no help or examples, and then proceed to tell me to do a google search. I know im wrong, thats why im posting here. The last I would need to for someone to repeat that I am wrong, and then provide no assisatance. Excellent.

Perhaps you should have read the forum guidelines including questions regarding homework, then.