In CUDA program, when I wrote the class like this:

```
class ensemble_model
{
public:
ensemble_model(void);
~ensemble_model(void);
int model_type;
unsigned int feature_dim;
unsigned int rand_dim;
unsigned int num_classifiers;
model **models_pt;
matrixindex **rand_index;
double negative_label;
double positive_label;
NDmatrix *mean;
NDmatrix *Std_variance;
bool standlize_type;
int checkpara(void);
unsigned int h_min;
unsigned int h_max;
unsigned int h_refer;
unsigned int w_min;
unsigned int w_max;
unsigned int w_refer;
double qtable[64];
double qtable_factor;
double qtable_previous[64];
double qtable_prev_factor;
double texture_complex;
};
```

When the members of a class assignment and data read again，the addresses of these data members will go wrong:

```
unsigned int h_min;
unsigned int h_max;
unsigned int h_refer;
unsigned int w_min;
unsigned int w_max;
unsigned int w_refer;
double qtable[64];
double qtable_factor;
double qtable_previous[64];
double qtable_prev_factor;
double texture_complex;
```

After that I exchange position of the two data sets, like this:

```
class ensemble_model
{
public:
ensemble_model(void);
~ensemble_model(void);
int model_type;
unsigned int h_min;
unsigned int h_max;
unsigned int h_refer;
unsigned int w_min;
unsigned int w_max;
unsigned int w_refer;
double qtable[64];
double qtable_factor;
double qtable_previous[64];
double qtable_prev_factor;
double texture_complex;
unsigned int feature_dim;
unsigned int rand_dim;
unsigned int num_classifiers;
model **models_pt;
matrixindex **rand_index;
double negative_label;
double positive_label;
NDmatrix *mean;
NDmatrix *Std_variance;
bool standlize_type;
int checkpara(void);
};
```

When the members of a class assignment and data read again，the addresses of these data members will also go wrong:

```
unsigned int feature_dim;
unsigned int rand_dim;
unsigned int num_classifiers;
model **models_pt;
matrixindex **rand_index;
double negative_label;
double positive_label;
NDmatrix *mean;
NDmatrix *Std_variance;
bool standlize_type;
```

Finally, I adjust the structure to this:

```
class ensemble_model
{
public:
ensemble_model(void);
~ensemble_model(void);
int checkpara(void);
double qtable[64];
double qtable_factor;
double qtable_previous[64];
double qtable_prev_factor;
double texture_complex;
double negative_label;
double positive_label;
unsigned int h_min;
unsigned int h_max;
unsigned int h_refer;
unsigned int w_min;
unsigned int w_max;
unsigned int w_refer;
unsigned int feature_dim;
unsigned int rand_dim;
unsigned int num_classifiers;
bool standlize_type;
int model_type;
model **models_pt;
matrixindex **rand_index;
NDmatrix *mean;
NDmatrix *Std_variance;
};
```

This time, the class member data address is right. But I don’t know why, anyone can explain this?