g77.info: BTest Intrinsic

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BTest Intrinsic

     BTest(I, POS)

BTest: `LOGICAL(KIND=1)' function.

I: `INTEGER'; scalar; INTENT(IN).

POS: `INTEGER'; scalar; INTENT(IN).

Intrinsic groups: `mil', `f90', `vxt'.

Description:

   Returns `.TRUE.' if bit POS in I is 1, `.FALSE.' otherwise.

   (Bit 0 is the low-order (rightmost) bit, adding the value 2**0, or 1,
to the number if set to 1; bit 1 is the next-higher-order bit, adding
2**1, or 2; bit 2 adds 2**2, or 4; and so on.)

   *Note Bit_Size Intrinsic::, for how to obtain the number of bits in
a type.  The leftmost bit of I is `BIT_SIZE(I-1)'.