A REAL*4 variable occupies 4 bytes. A REAL*8 8 bytes.
On some systems, e.g. Gould-SEL MPX and DEC VAX/VMS the two number systems are interchangeable - a REAL*4 and a REAL*8 at the same address have the same value except that the REAL*8 has greater precision. With IEEE numbers the values are...
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