Radio Shack TRS-80 Model 100 Basic Manual page 42

Experiment #4 Another Way to INPUT
The INPUT. statement is usually preceded by a prompt message to remind you what
value to enter. An optional form of the INPUT statement allows the prompt to be
printed without using a separate PRINT statement.
Delete line 15 (by entering just the line number 15) and retype line 10 as follows:
10 INPUT "PRINCIPAL"; P
This single line is equivalent to the previous lines 10 and 15. The word PRINCIPAL
will be printed immediately followed by a question mark. Then the Computer will
wait for you to enter the value for P. The ending quotation mark must be followed by
a semicolon, a comma cannot be used.
List the program.
It
should read:
10 INPUT "PRINCIPAL"; P
20 R = • 12
30 T ;;; 5
40 K
=
4
50 S
=
P
*
(1 + R / K)~(T
*
K)
60 PRINT "TOTAL IS $"; S
Execute the program. The following output occurs when you type 1000 for the
principal:
PRINCIPAL7 1000
TOTAL IS
$
1806.1112346693
Ok
II
Run the program several times, entering different values for the principal.
Experiment #5 Compound Interest with More
Keyboard Input
In this experiment, the compound interest program will be changed so that the rate, as
well as the principal, can be input from the keyboard.
Delete line 20 by entering just the line number.
Retype line 10 as:
10 INPUT "PRINCIPAL
t
RATE"; P
t
R (ENTER)
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