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Any idea what is wrong with this union?

 
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gjm27n



Joined: 15 Jun 2016
Posts: 23

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Any idea what is wrong with this union?
PostPosted: Sun Jul 10, 2016 1:28 pm     Reply with quote
Here are relevant snippets of code

Code:

union LONG_UNION
{
   signed int32   sl;
   unsigned int32   ul;
   signed int16   si[2];
   unsigned int16   ui[2];
   signed int8      sc[4];
   unsigned int8   uc[4];
};


union LONG_UNION   ulActiveAddr;

      ulActiveAddr.uc[3] = 0x00;
      ulActiveAddr.uc[2] = 0x00;
      ulActiveAddr.uc[1] = 0x01;
      ulActiveAddr.uc[0] = 0x00;

   printf("Part Addr = %8X, %2X, %2X, %2X, %2X\n",
      ulActiveAddr.ul,
      ulActiveAddr.uc[3],
      ulActiveAddr.uc[2],
      ulActiveAddr.uc[1],
      ulActiveAddr.uc[0]);



Prints the following
Part Addr = 00000000, 00, 00, 01, 00

I think it should print
Part Addr = 00000100, 00, 00, 01, 00

I'm using this to access an address on an external eeprom.
jeremiah



Joined: 20 Jul 2010
Posts: 1320

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PostPosted: Sun Jul 10, 2016 1:41 pm     Reply with quote
Use %LX instead of just %X for the larger data types.
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