Thread: Very basic File I/O help

I have a text file with one column of numbers. Eventually these numbers need to be added, averaged etc...but for right now I'm just trying to read them in, then print them out. My main problem is reading until EOF. Since I don't know how long the file will be...

Is there a way to fix this? Or a better way? Also, will I be able to do things like find the max value, min value, average etc using this format?

example of the text file:

43
23
746
543
76
2
654
....etc

Here's an example of the code I'm trying to write. This doesn't work properly though.

Code:

#include <stdio.h>
#include <conio.h>
void main()
{
	FILE *datafile;
	int data[9999];
	int x,s;
	int z=0;
	char path[80];

	printf("Please enter the location of the file to be opened: ");
	scanf("%s",&path);
	
	datafile=fopen(path,"r");

if(datafile == NULL)
{
	puts("Error opening file");
}
else
{
	while(data != EOF)
	{
		fscanf(datafile,"%i",&data[s]);
		s++;
		z++;
	}
	
	puts("Data: ");
	
	for(s=0;s<z;s++)
	{
		printf("%i\n",data[s]);
	}

}
getch();
}

Read this completely: Tutorial on C File I/O

Are you referring to using fgetc instead of fscanf? Won't fgetc only get one character at a time? Including all of the spaces and returning a char instead of an int? Because I need to do math on these numbers?

Please help I'm a novice when it comes to C.

Anyone?

Originally Posted by NewbGuy

Anyone?

We're still trying to figure out why you're checking data (the address in memory of your array) against EOF.

It's true that the FAQ page linked above assumes you know how scanf works. That doesn't appear to be true. (As in: scanf shouldn't use &path, and you need to read more about scanf to see what it does in case of eof.) If you had looked at the FAQ, you might have seen something interesting.