If
you require more, then the CLEAR statement must be used. Since it
is
unlikely a
name will be longer than 256 characters, the above program should not need the
CLEAR statement.
If,
on the other hand, your program had twenty string variables, each of which is used
to
hold a name, then the maximum of 256 would probably be exceeded. In this case,
the CLEAR statement would be needed.
Experiment
#8
Mortgage Payment Calculation
Clear working memory with the NEW command and type the following program from
the keyboard:
1121
INPUT
"INTEREST
RATE
(
121
-
1121121
) " ;
R
2121
R
=
R /
1121121
3121
INPUT
"AMOUNT
OF
LOAN
II
;
A
ill2l
INPUT
"NUMBER
OF
YEARS";
T
5121
N
=
12
*
T
8121
I
=
R /
12
7121
MP
=
( 1
-
( 1
+
I)~(-N»
/ I
8121
MP
= A /
MP
9121
PRINT
"MONTHLY
PAYMENT
IS
$"
j
MP
When you execute this program, you will be prompted for the interest rate, the
amount
of
the loan and the length
in
years
of
the loan. If the interest rate
is
12%
then
12
should be entered, not .12. Here
is
an example of the execution of the program.
INTEREST
RATE
(0
-100)?
12
AMOUNT
OF
LOAN
?
30000
NUMBER
OF
YEARS
?
25
MONTHLY
PAYMENT
IS
$
315.967242659281
Line
10
allows the interest rate to be entered and stores it in variable
R.
Line 20 converts the interest rate to a decimal value.
It
is
important
to
note that the equals symbol
(=)
in
a BASIC program means "assign
the value computed on the right side to the variable on the left side."
It
does not
mean the right side
is
equal
to
the left side as in an algebraic equation. Thus the
assignment statement:
R = R
/100
means to compute the right side, R / 100, and then store the result back
in
R.
Line 30 allows the amount of the loan to be entered and stored in numeric variable
A.
Remember that numeric values are entered without a comma.
41
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