Section 8: Program Branching and Controls 97
Now run the program to find the total amount needed in an account from
which you want to take $250/month for 48 months. Enter the periodic
interest rate as a decimal fraction, that is, 0.005 per month. First find the
sum needed if payments will be made at the beginning of the month
(payments in advance), then calculate the sum needed if payments will be
made at the end of the month (in arrears).
Keystrokes Display
| ¥
Set to Run mode.
250 v
250.0000
Monthly payment.
48 v
48.0000
Payment periods (4 years × 12
months).
.005
0.005
Monthly interest rate as a
decimal fraction.
´ B
10,698.3049
Deposit necessary for
payments to be made in
advance.
(Repeat stack entries.)
´ E
10,645.0795
Deposit necessary for payment
to be made in arrears. (The
difference between this
deposit and the tuition cost
($12,000) represents interest
earned on the deposit!)
Further Information
Go To
In contrast to the nonprogrammable sequence t ” nnn, the
programmable sequence t label cannot be used to branch to a line
number, but only to program label (a line containing ´ b label).
*
Execution continues from the point of the new label, and does not return
to the original routine unless given another t instruction.
t label can also be used in Run mode (that is, from the keyboard) to
move to a labeled position in program memory. No execution occurs.
*
It is possible to branch under program control to a particular line number by using
indirect addressing, discussed in Section 10.
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