2 replies to this topic

[bb1]

Just bought (Australia) an fx-100AU. There is a bug in vulgar fraction handling used with the ^ key.

Try the cube root of 8 (which is 2) with the cube root symbol gives 2

Try 8^0.3333333 or 8 to the one third power, gives very close to 2

Try 8^ and use the a.b/c key to enter 1/3 as a vulgar fraction. The answer is two and two-thirds

The fourth root of 16 (also two) is fine with 16^0.25 = 2

But 16^ with 1/4 appended as a vulgar fraction gives you an answer of 4

Other vulgar fraction arithmetic appears OK

Enjoy

[bb1]

I have solved the 'bug'. It is an unlikely execution order.

8^one third is read by the calculator as 8^1 divided by three, which is two and two thirds

similarly 16^one quarter is read as 16^1 divided by four, which is four

You can get the expected result by enclosing the one third, or one quarter in brackets, but then you might as well have used the normal division symbol

Panic over, but still a bug of sorts

[Vinx]

Hi, bb1.

That's not a bug because in every CASIO scientific calculator, the power sign ( ) takes priority before the fraction sign ( ); so, 8^1˼3 is (8^1)/3 and not 8^(1/3).

Try consulting your fx-100AU user's guide; see page 36 on topic "Orders of Operations", you'll see that powers and roots take 3rd order while fractions take 4th order (the lesser order, the more priority).

BTW, you can use parenthesis to change these order as needed. It takes 0th order.