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Section 4: Programming 2 71
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Programming Label C : Difference Between Savings and Downpayment
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Here we are looking for successive values of the difference between the label A and label B
calculations for each month.
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The program has to start by recalling the initial Values for savings and downpayment so that the
difference for month 1, 2, 3, . . . etc. can be calculated. This means that we cannot press C
and get successive values for the difference. Therefore, a slightly different technique using
looping and R/S is used in the program.
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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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As before, you should see 24, the code for RTN at the end of LBL B. You are ready to
enter 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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C
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13
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RCL 1
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34 01
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Reset savings and
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STO 2
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33 02
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dnpmt to
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RCL 4
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34 04
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Initial conditions
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STO 5
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33 05
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LBL
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23
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0
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00
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Return point
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B
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12
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Calulate savings
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A
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11
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Calculate dnpmt
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–
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51
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difference
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R/S
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84
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GTO
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22
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0
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00
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KEY
ENTRY
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CODE
SHOWN
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Savings – Dnpmt = Difference
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Note that Label C first calls B to calculate the savings and then calls A to calculate the
downpayment before subtracting and stopping.
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To operate:
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3.
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Switch to RUN.
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4.
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Follow the instructions below.
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STEP
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INSTRUCTIONS
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INPUT
DATA/UNITS
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KEYS
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OUTPUT
DATA/UNITS
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To see difference for month 1,
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press [C]. To see successive
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–1815.00
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differences, repeatedly press
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–1628.05
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–1439.13
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ETC.
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