Question

These above are the codes.                  
    demo_printf("Sampled NodeId %d %lu\n", NodeId,"Sampled SignalSTR %d %lu\n", Signal,"Sampled FirmwareVER %d %lu\n", FirmwareVER,"Sampled battery %f %lu\n", batt,timestamp);
    kaa_error_t error = kaa_logging_add_record(
            kaa_client_get_context(kaa_client)->log_collector,
            log_record, NULL);

以下是错误。我不明白错误是什么。到目前为止，C语言的新功能...似乎对于我的浮点变量，我不能使用'％'来执行我的random（）函数。以下是错误：

/home/pi/try/client/c/src/kaa_demo.c: In function ‘send_temperature’:
/home/pi/try/client/c/src/kaa_demo.c:72:22: error: invalid operands to binary % (have ‘int’ and ‘double’)
  float batt = rand() % 5.0;
                      ^
/home/pi/try/client/c/src/kaa_demo.c:73:21: error: invalid operands to binary % (have ‘int’ and ‘double’)
  float cel = rand() % 5.0;
                     ^
/home/pi/try/client/c/src/kaa_demo.c:74:20: error: invalid operands to binary % (have ‘int’ and ‘double’)
  float wt = rand() % 5.0;                                                       // kaa_logging_data_collection_t is the structure defined to contain temperature and time_stamp
                    ^
/home/pi/try/client/c/src/kaa_demo.c:81:12: error: ‘kaa_logging_data_collection_t’ has no member named ‘NodeId’
  log_record->NodeId = kaa_string_copy_create("Screws");
            ^
/home/pi/try/client/c/src/kaa_demo.c:82:15: error: ‘kaa_logging_data_collection_t’ has no member named ‘SignalSTR’
     log_record->SignalSTR = Signal;
               ^
/home/pi/try/client/c/src/kaa_demo.c:83:12: error: ‘kaa_logging_data_collection_t’ has no member named ‘FirmwareVER’
  log_record->FirmwareVER = kaa_string_copy_create("Linux KIDS");
            ^
/home/pi/try/client/c/src/kaa_demo.c:84:12: error: ‘kaa_logging_data_collection_t’ has no member named ‘OnlineStat’
  log_record->OnlineStat = status;

Answer 1

您的前三个错误是由模数运算符不能与实数一起使用的结果。并且您使用实数来划分rand（）的输出，它是整数。这里解释的主题是：（Why does modulus division (%) only work with integers?）

请您分享结构（kaa_logging_data_collection_t）元素：如果你可以的话。那么只有任何人都可以确定为什么会出现这些错误。

这些错误是什么？

1 个答案: