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Section 4: Programming 2 72
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Programming Label D : Months for Savings to Overtake Downpayment
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Instead of calculating monthly a sequence like before, the task here is to calculate a specific
answer—the month at which sayings are great enough to permit purchase of the house. We will
set up a counter for the number of months in R8 and use a logical test (x>y, i.e.,
downpayment>savings) to decide if we should continue for another month or if the increased
savings has overtaken the required downpayment.
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1.
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Switch to W/PRGM. Do not press fPRGM.
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2.
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See 84, the code for R/S. Since R/S was not the last instruction in LBL C,
press SST, see 22, the code for GTO.
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3.
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Now press SST, see 00, the code for 0. You are now at the end of the previous
segment of the program and are ready to key in the sequence below.
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KEY
ENTRY
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CODE
SHOWN
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COMMENTS
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LBL
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23
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D
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14
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RCL 1
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34 01
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STO 2
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33 02
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Reset savings and
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RCL 4
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34 04
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dnpmt
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STO 5
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33 05
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0
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00
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Start month zero
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STO 8
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33 08
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LBL
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23
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1
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01
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Return point
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1
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01
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STO
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33
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Add one to month
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+
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61
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counter
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8
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08
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B
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12
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Calculate savings
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A
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11
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Calculate dnpmt
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g x>y
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35 24
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If savings less
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GTO
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22
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than dnpmt return
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1
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01
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to LBL 1, otherwise
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RCL 8
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34 08
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recall month
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RTN
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24
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