Texas Instruments Titanium TI-89, User Manual

Page: 810 / 977

Appendix A: Functions and Instructions 807
InputStr
CATALOG
InputStr [ promptString , ] var
Pauses the program, displays
promptString
on the
Program I/O screen, waits for you to enter a
response, and stores your response as a string in
variable
var
.
If you omit
promptString
, “?” is displayed as a prompt.
Note: The difference between
Input
and
InputStr
is that
InputStr
always stores the result as a string
so that “ ” are not required.
Program segment:
©
:InputStr "Enter Your Name",str1
©
inString()
MATH/String menu
inString( srcString , subString [ , start ] )
⇒
integer
Returns the character position in string
srcString
at
which the first occurrence of string
subString
begins.
start
, if included, specifies the character position
within
srcString
where the search begins. Default = 1
(the first character of
srcString
).
If srcString does not contain subString or start is > the
length of srcString , returns zero.
inString("Hello there","the")
¸
7
"ABCEFG" ! s1:If inString(s1,
"D")=0:Disp "D not found." ¸
D not found.
int()
CATALOG
int( expression )
⇒
integer
int( list1 )
⇒
list
int( matrix1 )
⇒
matrix
Returns the greatest integer that is less than or
equal to the argument. This function is identical to
floor()
.
The argument can be a real or a complex number.
For a list or matrix, returns the greatest integer of
each of the elements.
int(
ë
2.5)
¸ ë
3.
int([-1.234,0,0.37])
¸
[-2. 0 0.]
intDiv()
CATALOG
intDiv(
number1
,
number2
)
⇒
integer
intDiv(
list1
,
list2
)
⇒
list
intDiv( matrix1 , matrix2 )
⇒
matrix
Returns the signed integer part of argument 1
divided by argument 2.
For lists and matrices returns the signed integer part
of argument 1 divided by argument 2 for each
element pair.
intDiv(
ë
7,2)
¸ ë
3
intDiv(4,5)
¸
0
intDiv({12, ë 14, ë 16},{5,4, ë 3})
¸
{2 ë 3 5}
integrate
See
‰
()
, page 880.
iPart()
MATH/Number menu
iPart(
number
)
⇒
integer
iPart(
list1
)
⇒
list
iPart(
matrix1
)
⇒
matrix
Returns the integer part of the argument.
For lists and matrices, returns the integer part of
each element.
The argument can be a real or a complex number.
iPart( ë 1.234) ¸ ë 1.
iPart({3/2,
ë
2.3,7.003})
¸
{1
ë
2. 7.}