Example

 $ A[0,32] = %X2B
 $ SHOW SYMBOL A
   A = "+..."
 $ X = F$CVUI(0,4,A)
 $ SHOW SYMBOL X
   X = 11   Hex = 0000000B  Octal = 00000000013

     This example uses an arithmetic overlay to assign the
     hexadecimal value 2B to all 32 bits of the symbol A. The
     symbol A has a string value after the overlay because it was
     previously undefined. (If a symbol is undefined, it has a
     string value as a result of an arithmetic overlay. If a symbol
     was previously defined, it retains the same data type after
     the overlay.) The hexadecimal value 2B corresponds to the ASCII
     character "+".

     Next, the F$CVUI function extracts the low-order 4 bits
     from the symbol A; the low-order 4 bits contain the binary
     representation of the hexadecimal value B. These bits are
     converted, as a signed value, to an integer. The converted
     value, 11, is assigned to the symbol X.