Radio Shack TRS-80 Model 100 Basic Manual page 54

Each condition can contain only one relational operator. Thus the following condition
is not allowed:
A<>B<>C
It should be clear that IF/THEN is a very powerful statement because it allows the
program to carry out different tasks and functions, depending upon the value or values
of numeric expressions.
Experiment #2 Printing Dollars and Cents
One unsatisfactory aspect of the Sales Commision program is that the value printed for
the commission does not directly indicate dollars in the customary fashion.
Run the program and enter the value 1763.89 for the total sales. You will see that
264.5835 is printed out for the amount of the commission. The output of the program
is a decimal number that sometimes contains more than two digits to the right of the
decimal point.
It would be much neater if the commission were printed to the nearest cent each time.
One way of accomplishing this is to use a different print statement. Instead of using
PRINT, the
PRINTUSING
statement can be used to format the output.
Make the following changes to the program:
Change line 40 as follows:
40 PRINT "COMMISSION IS ";
and add a new line 50
50 PRINTUSING
"####.##";
CM
Line 40 will display the message
COMMISSION IS
and line 50 will print the value of the commission. Now if you execute this revised
program you will see that the commission is printed, as desired, rounded to the nearest
cent.
For example, run the program and enter 1763.89 as the sales amount. This time the
commission amount prints as 264.58.
The string enclosed in quotes,
####.##
is called a format specifier, and it indicates how a number is to be printed.
Since two of the
#
symbols appear to the right of the decimal point, exactly two
digits will be printed to the right of the decimal point. By the same token, a maximum
of four digits to the left will be printed. (Fewer than four digits to the left of the
decimal point may
be
printed, depending on the size of the number.)
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