Compilare: user.cpp:10:52: warning: converting to non-pointer type ‘unsigned char’ from NULL [-Wconversion-null] unsigned char initialMatrix[MAX_N][MAX_N] = { NULL }; ^ user.cpp:12:41: warning: converting to non-pointer type ‘int’ from NULL [-Wconversion-null] int resultMatrix[MAX_N][MAX_N] = { NULL }; ^ user.cpp: In function ‘void Read()’: user.cpp:33:51: warning: format ‘%d’ expects argument of type ‘int*’, but argument 3 has type ‘unsigned char*’ [-Wformat=] fscanf(fin, "%d", &initialMatrix[i][j]); ^ user.cpp:27:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &m, &n); ^ user.cpp:33:52: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &initialMatrix[i][j]); ^