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Typedef union problem

Artem Gusev

Hello! I have a typedef union and variable:

typedef union int2char{unsigned char high_byte;
                       unsigned char low_byte;
                       unsigned int  int_byte;
                      } int2char;

int2char dac_value;


When i assign

dac_value.int_byte = 0xAAAA;


i have

dac_value.int_byte = 0xAAAA;
dac_value.low_byte = 0xAA;
dac_value.high_byte = 0xAA;


but when i assign,example,0xFF05

dac_value .int_byte = 0xFF05;
dac_value.low_byte =0xFF;
dac_value.high_byte = 0xFF;


same results are obtained when i assign,example,0x1005

dac_value .int_byte = 0x1005;
dac_value.low_byte =0x10;
dac_value.high_byte = 0x10;


I can not understand where the error and why??
thanks for the help!.

Parents
  • 0 in reply to ImPer Westermark

    Yes indeed the problem I have decided in two ways, should announce:

    typedef union int2char{
unsigned int int_byte;
unsigned char char_byte[2];}int2char;


    } or

    typedef union int2char{
unsigned int int_byte;
struct char_byte{
unsigned char high_byte;
unsigned char low_byte;}char_byte;
}int2char;

}


    Thanks a lot for such an active assistance
    also sorry for the low level of English, I use a translator. :)

Reply
  • 0 in reply to ImPer Westermark

    Yes indeed the problem I have decided in two ways, should announce:

    typedef union int2char{
unsigned int int_byte;
unsigned char char_byte[2];}int2char;


    } or

    typedef union int2char{
unsigned int int_byte;
struct char_byte{
unsigned char high_byte;
unsigned char low_byte;}char_byte;
}int2char;

}


    Thanks a lot for such an active assistance
    also sorry for the low level of English, I use a translator. :)

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