Trouble with File Input/Output concerning loops

[Mageplasm]

I'm writing a C program to read in data from a file. The file contains integer values. The program outputs the minimum and maximum integer values of each line of the file.

Here's the text file:
7
905 177 738 891 912 853 271
607 894 958 848 636 691 309
953 888 153 485 969 483 379
151 196 106 387 115 569 788

The first number denotes the number of columns or elements in each row.

The problem I'm having is that my program prints out the minimum and maximum value of each line (excluding the first line) just fine but then it seems to print out another set of values at the end that I don't need. For example here's my output:

min: 177 max: 912
min: 309 max: 958
min: 153 max: 969
min: 106 max: 788
min: 151 max: 788 <--------- UNNECESSARY OUTPUT

And here's the program:

#include <stdio.h>
void open_file ();
 
int main()
{
  open_file();
  return 0;
}
 
void open_file()
{
  int first_num, num, max, min, loop, update;
  FILE *fp;
  int columns;
  fp = fopen("stats_data.txt", "r");
  loop = fscanf(fp, "%d", &columns);
 
while (loop != EOF)
{
  update = (columns - 1);
  fscanf(fp, "%d", &first_num);
  max = first_num;
  min = first_num;
 while (update > 0)
  {
   loop = fscanf(fp, "%d", &num);
 
   if (num > max)
    max = num;
 
   if (num < min)
    min = num;
 
   update = update - 1;
  }
 
  printf("min: %d ", min);
  printf("max: %d ", max);
  printf("\n");
 
}
 
}

Any help is greatly appreciated!

[Rabbit]

That is because after it reads the last number, it is not at EOF yet. And so it loops one more time.

[divideby0]

if you're using fscanf, you might try something like

int i = 0;
...
 
while(fscanf(fp, "%d", &num) == 1) {
 
    // if desired, print num in each line
 
    /* compare i to zero; if it is
       assign min, max, to num
    */
 
    // test min, max against num 
 
    // increment i
 
    /* check i against columns
       if it's equal, reset i
       print the low and high values
    */ 
}
 
if(!feof(fp))
   // file read error
...