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260
Flags
Data Entry Flag
The data entry flag, flag F3, is a flag that is set for data entry and
cleared upon test. These features of this flag can be used for
interchangeable solutions in a program.
Example: The program below calculates the distance (d), speed (s),
or time () for a moving body according to the following formulas:
d = st
distance = speed X time
speed = distance + time
time = distance + speed
Given any two of the quantities d, s, and ¢, the program will calculate
the third. The program uses the test-clearing feature of data entry
flag F3 to decide whether to store a quantity away or to use pre-
viously stored quantities for calculation. If you recorded the program
on a magnetic card, the card might look like this:
& DISTANCE, SPEED, AND TINE 4
Berdygcr S_e>
As you can see from the flowcharts shown on pages 261 and 262,
when the user-definable key I3, 3, or [@ is pressed, a decision is
made. If you have keyed in a value, that value is stored for further
calculations. If you have not keyed in a value, the program calculates
the desired quantity. The decision to store or to calculate is made
depending upon whetherthe data entry flag, flag F3, is set or cleared.
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