HP 35s Instruction Manual page 3

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HP 35s Using HP 35s Flags
This time the user must press 2 to select the CF (Clear Flag) operation.
The little 1 is still shown. Now the user needs to press 1 to make the CF operation act on flag 1.
Answer: Flag 1 is now clear, so the small number 1 is no longer at the top of the calculator screen.
Example 3: Use the "Flag Set?" command to confirm that flag 1 is now clear.
Solution: Use the same steps, but this time choose the third command in the flags menu, to ask if flag 1 is set.
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Answer: The display shows the message NO to tell the user that the answer to the question "is Flag 1 Set?" is "No".
Note: If the flag is set, the message YES is shown. The messages YES and NO replace the normal display of numbers
on the HP 35s screen, and the message symbol â is displayed. This does not mean that an error has been detected,
instead it warns the user that a message is being shown, and must be cleared before normal operation can continue. To
clear the message, press one of the two keys ~ or Å. Å is the "Clear" key, at the lower left of the keyboard; it is
also used as the Æ key.
The examples above show how flags can be set, cleared and tested by commands carried out on the keyboard. Flags
are also very useful in programs, as is described below.
General-purpose Flags and Special Flags
HP 35s users can set, clear, and test 12 different flags. When the HP 35s is turned on first, all these flags are clear.
Flags 0 through 4 are general-purpose flags, for use as signals and in programs. When one of these flags is set, its
number is shown at the top of the HP 35s screen. The 0 looks like a degree sign and 1 like an exclamation point.
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HP 35s Using HP 35s Flags - Version 1.0