On 19/04/2012 12:03, Miguel Angel Rodriguez Jodar wrote:
El 19/04/2012 12:00, Bryan Horstmann escribió:
I've had a look at Python too, Malcolm, and found "Python Languages &
Syntax
Cheat Sheet". Under basic arithmetic it says "i=a%b e.g. 11%3 > 2" I
cannot make
sense of that.
That's the modulus operator, as in C language. The binary operator a%b
returns the remainder of the integer division between "a" and "b".
It's equivalent to the MOD function in SBASIC.
For example, 11%3 returns 2 because 11 divided by 3 gives 3 and
remainder 2.
It's a very powerfull operator to perform modular aritmethic. For
example, imagine that you want to calculate fast sine functions, and
to to that, you have set up a table with 360 numbers, indexed from 0
to 359. Element with index "i" will contain the sine of "i" (with "i"
expressed in degrees).
Then, for an arbitrary (positive integer) angle, you can do something
like:
sineofi = sinetable[i%360];
The index expression inside the brackets will wrap around 360, giving
you 0,1,2,...,358,359,0,1,....
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Thanks Miguel. I've no knowledge of C and my scientific calculator
wouldn't accept it.
Bryan H
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