c++ - How to count the different packet number in two text file -

i have 2 text files in.text , out.text. read them in unsigned char **, in each element of array stores data length t=32 bellow code

char *filename = "in.text"; file *stream; int numpackets = 10; int t = 32; // length of each packets unsigned char **packetsin; fopen_s(&stream, filename, "rb");    fseek(stream, 0, seek_set); (int = 0; < numpackets; i++) {           fread(packetsin[i], 1, t, stream);       } fclose(stream); 

in same manner way, can obtain packetsout above code

filename = "out.text"; file *streamout; numpackets = 10; t = 32; // length of each packets unsigned char **packetsout; fopen_s(&streamout, filename, "rb");     fseek(streamout, 0, seek_set); (int = 0; < numpackets; i++) {           fread(packetsout[i], 1, t, streamout);       } fclose(streamout); 

i want count how many different packet in packetsin , packetout (each of them has 10 packets, compare first packet in packetsin , first packet in packetsout. if different, count increases 1). me solve it

this tried

int count = 0; (int = 0; < numpackets; i++) {           if (packetsin[i] != packetsout[i])        count++;  } 

packets arrays of bytes, must allocate memory these arrays, either automatic storage, local function or heap malloc. furthermore, cannot compare arrays == or !=, need use function performs byte byte comparison. memcmp declared in <string.h> , returns non 0 value if arrays differ.

here corrected version:

#include <string.h>  int compare_packets(void) {     file *stream;     int numpackets = 10;     int t = 32; // length of each packet     unsigned char packetsin[numpackets][t];     unsigned char packetsout[numpackets][t];      fopen_s(&stream, "in.text", "rb");        (int = 0; < numpackets; i++) {               fread(packetsin[i], 1, t, stream);           }     fclose(stream);      fopen_s(&stream, "out.text", "rb");         (int = 0; < numpackets; i++) {               fread(packetsout[i], 1, t, stream);           }     fclose(stream);      int count = 0;     (int = 0; < numpackets; i++) {               if (memcmp(packetsin[i], packetsout[i], t)             count++;      }     return count; }