Language Reference

+-------------------------------IBM Extension--------------------------------+

ILEN(I)

Returns one less than the length, in bits, of the twos complement representation of an integer.

I

is of type integer

Class

Elemental function

Result Type and Attributes

Same as I.

Result Value

• If I is negative, ILEN(I)=CEILING(LOG2(-I))
• If I is nonnegative, ILEN(I)=CEILING(LOG2(I+1))

Examples

I=ILEN(4)  ! 3
J=ILEN(-4) ! 2

+----------------------------End of IBM Extension----------------------------+