疑问

//eg1能进入if，eg2不能进入if,暂时还不清楚为什么

typedef unsigned char  UINT8_T;
typedef unsigned short UINT16_T;
typedef unsigned long  UINT32_T;

UINT16_T i = 0
UINT8_T raw_rsp_data[MAX_RESP_LEN] = { 0 };
UINT32_T rsp_data[]

eg1:
int num = raw_rsp_data[3] + 5;
int data_num_0 = 0;
int data_num_1 = 0; 
while (i < num)
    {
        data_num_0 = raw_rsp_data[i];
        if (data_num_0 == 0xf3)
        {
            data_num_1 = raw_cmd_data[i + 1];
            if (data_num_1 > 5)
            {
                rsp_data[j] = raw_rsp_data[i];
                j++;
            }
            else
                num++;
        }
        else
        {
            rsp_data[j] = raw_rsp_data[i];
            j++;
        }
        i++;
    }

eg2:
int num = raw_rsp_data[3] + 5;
    while (i < num)
    {
        if (raw_rsp_data[i] == 0xf3)
        {
            data_num_1 = raw_cmd_data[i + 1];
            if (raw_rsp_data[i+1] > 5)
            {
                rsp_data[j] = raw_rsp_data[i];
                j++;
            }
            else
                num++;
        }
        else
        {
            rsp_data[j] = raw_rsp_data[i];
            j++;
        }  
        i++;
    }