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converting a char to short, int, etc

Posted on 2006-04-30
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Last Modified: 2009-12-16
I know a char is 1 byte, short is 2 byte, long 4 byte. The program I am writing stores data 1 byte at a time in an array. Now is there a way to take 2 bytes of data and convert it to a short? And is there a way to take a short and convert it to 2 1 byte chars and store them in a char[2] array?

C Code would help me. Thank you for your time.
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Question by:Linky
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Kent Olsen earned 200 total points
ID: 16574711
Hi Linky,

When you move data from a char, short, int, or long to another variable of any of these types, C does the conversions for you.  If you're moving something that's too long, C truncates to the left.  If the new field is longer, C sign extends so that the true value is copied.

But I think that you want to do something just a bit different.  You seem to want to move the bytes of an integer to a character array, and back again.

The only real trick is to use UNSIGNED values.  The sign bit gets very tricky!  But that's OK.  If the value is signed, recasting will work.  But it's easier to see if you start with unsigned values.  Oh.  The char array MUST be unsigned.

char Array[2];
int    Value;

  Array[0] = Value;
  Array[1] = Value >> 8;

// And going the other way

  Value = (Array[1] << 8) | Array[0];


Good Luck!
Kent
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by:Linky
ID: 16574757
Unsigned values won't be a problem. Thank you.
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