Thread: File I/O

Hi, I am new here and this is my first time posting. I am a usually a java student but i have to take this C class.
What I want my program to do is open the text file that is in the same directory and read in two floats ( using scanf ), then use fgets to read the name as everything until end of line. Then go to the next line and do the same thing until end of file. My program needs to read from stdin and terminate at end of file.

here is the code

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main()
{
	char buf[80];
	FILE * fp;
	char * ptr;
	float x, y;

	do
	{
		fp = fopen ( "file.txt", "rw+" );
		fgets ( buf, 80, fp );
		if ( ( ptr = strchr ( buf, '\n' ) ) )
		{
			*ptr = 0;
		}
		fprintf( stdout, "%s\n", buf );
	}
	while ( 2 == scanf("%f %f", &x, &y) && fgets(buf, sizeof(buf), stdin) != NULL);
	fclose ( fp );		
	return 0;
}

this is the text file

Code:

38.5 12.75 Bob, Joe
17.5 9.25 Bob, Jolene
20.0 9.65 Smith, Janet 
25.0 8.25 Public, John Q.
40.0 8.75 Doe, Jane 
15.0 6.25 Ling, Grunt

this is what i have now but i still can't get it to go to the next line in the text file it just keeps repeating the first line.

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main()
{
	char buf[80];
	FILE * fp;
	char * ptr;
	float x, y;

	while( fgets( buf, sizeof(buf), stdin ) != NULL )
	{
		fp = fopen ( "file.txt", "rw+" );
		fgets ( buf, sizeof(buf), fp );
		if( sscanf( buf, "%f %f %[^\n]", &x, &y, buf ) != 3 )
	       {	
			printf("error");
		}
		else
		{
        		if ( ( ptr = strchr ( buf, '\n' ) ) )
			{
				*ptr = 0;
			}
			fprintf( stdout, "%s %f %f\n", buf, x, y );
		}	
	}	

	fclose ( fp );		
	return 0;
}

First, I havent really read this thread, just your last post.

...it just keeps repeating the first line.

Code:

while( fgets( buf, sizeof(buf), stdin ) != NULL )
	{
		fp = fopen ( "file.txt", "rw+" );
		fgets ( buf, sizeof(buf), fp );
		// ...
	}

Each iteration of the "while" loop you re-open the file, and read whatever-many bytes. You probably want to only open the file once, just before the loop.

its always the little things thats get me. its works perfect now Thanks!