C program: Error reading and printing a particular

Question

I want to print column 6 from a text file "1PGB.pdb" into an output file "out". Following is my code:

#include <stdio.h>
#include <stdlib.h> /* For exit() function*/
#define ROW 500
#define COL 12
int main()
{
int n6, garbage;
FILE *fp;
FILE *op = fopen("out", "w");
int score[ROW][COL];
int row, col, item, i, j;
if ((fp=fopen("1PGB.pdb","r"))==NULL)
{
        printf("Error! opening file");
        exit(1);         /* Program exits if file pointer returns NULL. */
}
for(row=0; row<ROW; row++)
{
col=5;


fscanf(fp, "%d", &score[row][col]);
fprintf(op, "%d", score[row][col]);

fclose(fp);
    fclose(op);
 }
 return 0;
 }

It gives the following error.

Error in `./Code1': double free or corruption (out): 0x0000000000cde250 *** Aborted (core dumped)

The first few lines of 1PGB.pdb file are:

ATOM      1  N   MET A   1      12.969  18.506  30.954  1.00 15.93           N  
ATOM      2  CA  MET A   1      13.935  18.529  29.843  1.00 17.40           C  
ATOM      3  C   MET A   1      13.138  18.692  28.517  1.00 14.65           C  
ATOM      4  O   MET A   1      12.007  18.222  28.397  1.00 13.04           O  
ATOM      5  CB  MET A   1      14.733  17.216  29.882  1.00 20.72           C  
ATOM      6  CG  MET A   1      15.742  16.983  28.738  1.00 23.81           C  
ATOM      7  SD  MET A   1      17.378  17.025  29.359  1.00 28.11           S  
ATOM      8  CE  MET A   1      17.166  16.055  30.819  1.00 27.51           C  
ATOM      9  N   THR A   2      13.719  19.413  27.573  1.00 12.63           N  
ATOM     10  CA  THR A   2      13.088  19.661  26.283  1.00 12.68           C  
ATOM     11  C   THR A   2      13.561  18.631  25.300  1.00 12.02           C  
ATOM     12  O   THR A   2      14.763  18.432  25.121  1.00 13.07           O  
ATOM     13  CB  THR A   2      13.527  20.980  25.667  1.00 14.62           C  

Answer 1

This seems like a good, simple approach:

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

int main()
{
    char line[1000];
    int n6;
    FILE *fp = fopen("1PGB.pdb", "r");
    FILE *op = fopen("out", "w");

    if (fp == NULL || op == NULL)
    {
        fprintf(stderr, "Error opening file.");
        exit(1);
    }

    while (fgets(line, sizeof(line), fp) != 0)
    {
        /* Use "%*s" to skip a word when using scanf. */
        sscanf(line, "%*s %*s %*s %*s %*s %d", &n6);
        fprintf(op, "%d\n", n6);
    }
    return 0;
}