编辑代码

#include <stdio.h>
#include <stdio.h>
typedef enum
{
  HAL_OK       = 0x00U,
  HAL_ERROR    = 0x01U,
  HAL_BUSY     = 0x02U,
  HAL_TIMEOUT  = 0x00U
}x ;
int main () {
    
    printf("Hello world!     %d.",HAL_TIMEOUT);
    return 0;
}