Displays
as
Lines 58 • 68 These DATA statements contain the list
of
the days of
the
week.
Lowercase letters must be used for the second and third characters to correctly match
DAY$, which stores the first three characters of each day
of
the week (an uppercase
and two lowercase letters).
This program uses two string functions,
DA
Y$
and LEFT$. Recall that
DA
Y$
returns
the first three letters
of
the day of the week.
The function LEFT$(D$,3) returns the first three characters of the string stored
in
D$.
For example, if
D$
has Thursday assigned to it, then
PRINT LEFT$(D$,3)
would display
Thu
The number 3 indicates the number
of
characters to be returned. Again assuming that
D$
contains Thursday, then
Command
PRINT LEFT$(D$,1)
PRINT LEFT$(D$,2)
PRINT LEFT$(D$,5)
etc.
T
Th
Thurs
LEFT$
is
a string function
of
two arguments, the string (D$) and the number of
characters
to
be returned. The first argument need not be a string variable, it can also
be a string constant. For example,
PRINT
LEFTS(
"Model
100"
,3)
would display
as:
Mod
When a string constant
is
used
as
the argument, it must be enclosed
in
quotation
marks.
The last character in the name of both functions, LEFT$ and
DA
Y$,
is
a dollar sign
($)
because the quantity returned,
in
both cases,
is
a string.
Experiment
#2
Centering the Day
Program DAY
is
to
be changed so that the output will consist
of
the day of the week,
centered in the line with an equal number
of
asterisks (*) printed on both sides.
Make the following changes:
Retype line
40
as:
1I0 L = LEN·(
OS)
and type four new lines:
5 CLEAR
100
1I1i
AS =
STRINGS(
(1I0 -
L)/2,
u*U)
~G
OS
= AS +
OS
+ AS
LIB
PRINT
OS
59
To Next Page
Loading...
