C++ :: Reading Tab-delimited File - Information Of A Graph

I have a network data file that looks like this:

2476
112
213
321
426
531
634
7312
843
945
...
...
...

The first row has two values - number of nodes (24) and number of links (76). Then it has all the link details (76 rows of data). I want to read this data. I have written out the following function:

First the structure definitions:

typedef struct {
int arcno;
int tail;
int head;
} arc_data;
typedef struct {
int forwardStarPoint;
int reverseStarPoint;

[Code] .....

The code is able to read the first line of data (i.e. it displays the numNodes and numArcs as 24 and 76). But then I get a lot of errors like this one

`Access violation writing location 0xCCCCCCD8`.

The program then crashes.