Question

I’m on a Fedora 15 computer and I have a simple code that looks like this

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

int main()
{
    int x[50], y[50];
    int i;
    FILE *f_in = fopen("readtest.dat","r");

    if (f_in == NULL) printf("No file...\n");
    else
    {
        i = 0;
        while (!feof(f_in))
        {
            fscanf(f_in,"%d %d",&x[i],&y[i]);
            printf("%d %d\n", x[i], y[i]);
            i++;
        }
        printf("I've read %d data.\n", i);
    }
return 0;
}

The file to be read is this

1   1
2   2
3   3
4   4
5   5

But I don’t know why the output looks like this.

1   1
2   2
3   3
4   4
5   5
1250259108 1250140145
I've read 6 data.

I was thinking that I left a blank new line in the file, but I didn’t. I double checked the file with both gedit and vim and no blank lines were found. Why am I reading this unexisting line?

Answer 1

You should include a new line escape character in your fscanf

fscanf(f_in,"%d %d\n",&x[i],&y[i]);

Also dont forget to fclose your file

EDIT

I tried it and here are the results.

Without the \n

1 1
2 2
3 3
4 4
5 5
-1216418984 1
I've read 6 data.

With the \n

1 1
2 2
3 3
4 4
5 5
I've read 5 data.