Texas Instruments PLUS TI-89 - Manual (Page 516)

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 ë 1 (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) ¸
0b1000000000
In Hex base mode:
shift(0h78E) ¸ 0h3C7
shift(0h78E,ë 2) ¸ 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 ë 1 (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},ë 2) ¸
{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 ë 1 (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",ë 2) ¸ " ab"
shift("abcd",1) ¸ "bcd "
Inserts 0 if leftmost bit is 0,
or 1 if leftmost bit is 1.
Each bit shifts right.
Dropped