Texas Instruments TI-89, TI-92

Appendix A: Functions and Instructions 499

8992APPA.DOC TI-89 / TI-92 Plus: Appendix A (US English) Susan Gullord Revised: 02/23/01 1:48 PM Printed: 02/23/01 2:21 PM Page 499 of 132

shift() CATALOG

shift(integer1[,#ofShifts]) ⇒ integer

Shifts the bits in a binary integer. You can

enter integer1 in any number base; it is

converted automatically to a signed, 32-bit

binary form. If the magnitude of integer1 is

too large for this form, a symmetric modulo

operation brings it within the range.

If #ofShifts is positive, the shift is to the left. If

#ofShifts is negative, the shift is to the right.

The default is ë1 (shift right one bit).

In a right shift, the rightmost bit is dropped

and 0 or 1 is inserted to match the leftmost

bit. In a left shift, the leftmost bit is dropped

and 0 is inserted as the rightmost bit.

For example, in a right shift:

In Bin base mode:

shift(0b1111010110000110101)

0b111101011000011010

shift(256,1) ¸

000000000

In Hex base mode:

shift(0h78E) ¸0h3C7

shift(0h78E,ë2) ¸0h1E3

shift(0h78E,2) ¸0h1E38

Important: To enter a binary or

hexadecimal number, always use the 0b

or 0h prefix (zero, not the letter O).

0b00000000000001111010110000110101

produces:

0b00000000000000111101011000011010

The result is displayed according to the Base

mode. Leading zeros are not shown.

shift(list1 [,#ofShifts]) ⇒ list

Returns a copy of list1 shifted right or left by

#ofShifts elements. Does not alter list1.

If #ofShifts is positive, the shift is to the left. If

#ofShifts is negative, the shift is to the right.

The default is ë1 (shift right one element).

Elements introduced at the beginning or end

of list by the shift are set to the symbol

“undef”.

In Dec base mode:

shift({1,2,3,4}) ¸

{undef 1 2 3}

shift({1,2,3,4},ë2) ¸

{undef undef 1 2}

shift({1,2,3,4},1) ¸

{2 3 4 undef}

shift(string1 [,#ofShifts]) ⇒ string

Returns a copy of string1 shifted right or left

by #ofShifts characters. Does not alter string1.

If #ofShifts is positive, the shift is to the left. If

#ofShifts is negative, the shift is to the right.

The default is ë1 (shift right one character).

Characters introduced at the beginning or

end of string by the shift are set to a space.

shift("abcd") ¸" abc"

shift("abcd",ë2) ¸" ab"

shift("abcd",1) ¸"bcd "

Inserts 0 if leftmost bit is 0,

or 1 if leftmost bit is 1.

Each bit shifts right.

Dropped