Experiment
#3
What time
is
it?
Another useful feature
of
your Model 100 Computer
is
the string function TIME$,
which returns the time
as
a string
of
the form
hh:mm:ss
For example, if the time
is
exactly 1:05 PM, then the following command:
PRINT TIME$
would print
13:05:00
The first two digits indicate the hour
(l
PM), the second two digits the minutes;
(5
minutes after 1), and the last two digits the seconds.
The clock is a 24 hour clock,
so
the hours will range from 00
to
23, with 00
indicating midnight.
Note: The time must be initialized prior to using the TIME$ function. Once set,
it
will
keep the correct time just like a clock.
If
you have not already initialized the time,
you may do so by entering the following command:
TIME$
= "hh:mm:ss"
where hh
is
the hour, mm the minute, and ss the seconds. The hour
is
in 24 hour
format,
so
that 3 PM
is
hour 15. For example, if the current time is 3:05 PM, type
TIME$
=
"15:05:00"
(ENTER)
The following program will convert the string returned
by
TIME$, for example
14:18:00, to the customary format, 2:18 PM.
Clear the previous program from memory with the NEW command and then type the
following program:
10
HH$
=
LEFT$(TIME$,2)
20
HH
=
VAL<
HH$)
30
IF
HH>=
12
THEN
A$
= "
PM"
ELSE
A$
= "
AM"
40
IF
HH
> 12
THEN
HH
=
HH
- 12
50
HH$
= STR$(HH)
60
MMS
=
MID$(TIME$,4,2)
70
T$
=
HH$
+
":"
+
MM$
+
AS
80 PRINT
"THE
TIME
IS";
T$
After the program has been entered, execute it with the RUN command. An example
of the output is
THE
TIME
IS
1:05
PM
Line
Ht
The first two characters in TIME$ are assigned to the string variable HH$.
These two characters designate the hour. For example, if it
is
1:05 PM, then HH$ will
contain the two characters 13. Since LEFT$ returns a string, these two characters form
a string even though they are numerical digits. Thus they cannot be assigned to a
numeric variable.
62
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