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Section 4: Programming 1 64
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Switch to W/PRGM.
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Clear memory by pressing fPRGM.
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Key in following sequence.
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Keys
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Comment
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LBL B
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f-1SIN
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Compute arc sine.
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0
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0 to X lifts arc sine to Y.
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gx y
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Put 0 in Y and arc sine in X.
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gx≤y
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3
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Test and skip these steps
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6
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if angle is positive.
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0
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Add 0 or 360.
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+
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RTN
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Stop.
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Running the Function
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Switch to RUN.
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Press
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See Displayed
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Comment
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.5 B
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(degrees)
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.5 CHS B
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Looping N Times
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The DSZ operation is useful in repeating a labelled segment of a program a given number of times.
The repeated segment is called a loop. Rule: To execute a labeled program segment n times,
preset n in R8 and end the segment with a DSZ to determine whether or not to repeat the segment.
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If the angle is negative, 3 6 0 are put into the X register as 360.
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If the angle is positive, 3 6 are skipped and 0 puts zero into X.
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Thus, either 0 or 360 are added to the angle.
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Step saving techniques like this will undoubtedly occur to you in writing your own programs.
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