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reading 4-byte reals

 
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Norm.Campbell



Joined: 31 Aug 2007
Posts: 66
PostPosted: Mon Oct 15, 2007 2:45 pm    Post subject: reading 4-byte reals Reply with quote
Someone has sent me an ER Mapper real file, and I thought I knew how to decode it: read each lot of 4 bytes into a character*4 array, and then read the real number from the character array. It didn't give the correct number (which I can get using ER Mapper displays). (And byte swapping crashed the program.)

I then wrote out the correct number using an unformatted write; read the bytes back in; and decoded them using ichar. The 4 numbers for the 4 bytes are different to those from reading in the 4 bytes from the ER Mapper file and decoding them.

What am I doing wrong?

Do I have to go back to the IEEE specification, and do a bit dump to reconstitute the number?
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Robert



Joined: 29 Nov 2006
Posts: 445
Location: Manchester
PostPosted: Wed Nov 14, 2007 6:02 pm    Post subject: Reply with quote
Do you have a code fragment?
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