Question about Texas Instruments TI-86 Calculator
When I enter 7*(-1/7)+1
I get a return of 2E-14
When I enter 7*-1/7+1
I get the expected return of 0
It is a problem with fractions that have repeating decimals and does not exist with fractions that terminate.
answer comes in as expected, at zero
You may have guessed right. The presence of the parentheses makes the content of the parentheses evaluated first. So there is a loss of precision.
On the Ti92 I do 7*(-1/7)+1 and find 0.
But with Floating mode set at 12 decimal digits I get
Then .142857142857.*(-7) + 1 gives 2E-14.
Try to calculate pi*(-1/pi) +1 or e*(1/e)+1.
Hope it answers your question.
Posted on Sep 23, 2009
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Posted on Jan 02, 2017
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