typedef struct packet_info {
        int on;
        u_char  src_ip;                 /* source ip address */
        u_short dst_port;               /* destination port address */
        u_char  flag;
        #define TH_FIN  0x01
        #define TH_SYN  0x02
        #define TH_RST  0x04
        #define TH_PUSH 0x08
        #define TH_ACK  0x10
        #define TH_URG  0x20
        #define TH_ECE  0x40
        #define TH_CWR  0x80
        #define TH_FLAGS        (TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG|TH_ECE|TH_CWR)
}Packet_Info;

int main(int argc, char **argv)
{
        int i,j;
        char *dev = NULL;                       /* capture device name */
        char errbuf[PCAP_ERRBUF_SIZE];          /* error buffer */
        pcap_t *handle;                         /* packet capture handle */

        char filter_exp[] = "";         /* filter expression [3] */
        struct bpf_program fp;                  /* compiled filter program (expression) */
        bpf_u_int32 mask;                       /* subnet mask */
        bpf_u_int32 net;                        /* ip */
        int num_packets = 20;                   /* number of packets to capture */

        Packet_Info array[10][10];

        for(i=0;i<10;i++)
          for(j=0;j<10;j++)
            (array[j][i])->on = 0;

        for(i=0;i<10;i++)
          for(j=0;j<10;j++){
            printf("source %d packet %d ip field is %d\n", i+1, j+1,array[j][i]->on);
            getchar();
        }
....