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Program Interruptions
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In your programs, there may often be occasions when you want to halt
execution so that you can key in data, or to pause so that you can
quickly view results before the program automatically resumes. This
section shows you how to use STOP and
PSE for program interruptions, as well as how the
keyboard can be used to stop execution with
R/S , and how an error can halt a running
program.
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Using STOP and
R/S
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The STOP function can be placed into a program
as an instruction by pressing the R/S
(run/stop) key or by usng XEQ and
spelling the name (STOP). When executed in the program, the
STOP stops program execution after its
line of program memory.
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R/S function is only a keyboard function, that
is, it cannot be recorded as an instruction in a program. However, when
you press the R/S key in PRGM mode, a
STOP instruction is recorded in the program.
When you press the R/S key and the calculator is
not in PRGM mode:
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1.
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If a program is running, a STOP is executed
and program execution is halted. The only keys that can halt a
running program (from the keyboard) are the
ON and R/S keys.
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2.
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If a program is stopped or not running R/S
starts the program running beginning with the current line in the program.
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When using R/S to halt a running program,
remember that only the R/S key location
in the lower right-hand position of the keyboard, performs the run/stop
function. This is true even in USER mode, regardless of where
STOP is assigned to that location.
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Example: The following program calculates the volume of a sphere
given its radius. The program stops execution (with
STOP ) to let you key in the value of the radius
of the sphere.
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The formula for finding the volume of a sphere is V = (4πr3)÷3.
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