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Section 4: Programming 1 59
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If the pointer is at the bottom. and you try to insert a step, the code(s) will be generated in
the display, but will not go into memory. Deleting the bottom step also deletes the step ahead
of it. For a critical case like this. be sure to reinsert the last step.
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Test Operations
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To complete the discussion of programming the HP-65, we will consider the test operations summarized in
Figure 4-5. The test operations are particularly valuable for performing iterative calculations.
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Using the Flags for Programmed Decisions
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The calculator has two flags (called flag 1 and flag 2) available for your use. A flag is
an invisible piece of information with just two possible conditions: on or off.
The flag operations are given in Figure 4-5. p. 63. You can set a flag on or off
by using the Set Flag operations. These operations can be executed from the keyboard or from a program.
The reason for setting a flag is so that a program can later make a decision based on the condition
of the flag (using the test flag operations).
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Sample Case. Flags. Create a function A that computers (1/x)2 if flag 1 is
on and computes (x2) if flag 1 is off. Assume that the desired condition of
flag 1 has been previously set.
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Switch to W/PRGM
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Clear memory by pressing fPRGM
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Key in the following steps.
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Keys
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Comment
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LBL A
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fTF1
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Test flag 1 for on.
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g
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If on, calculate (1/x).
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1/x
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f-1
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Square x or 1/x.
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RTN
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Stop.
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If flag is on, these two steps are not skipped. If off, they are skipped and x is
not replaced by 1/x.
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