math question

J. Baker · Post by **J. Baker** » Sat Sep 11, 2004 2:28 am

Going through the PureBasic help and came across this.

b = 4 * (2 - (3 - 4))

It says this equals 12 but to me it seems this should equal -4.

Could some one explain why this equals 12?

Here's how I got -4.

b = 4 * (2 - (3 - 4))
b = 4 * (2 - (1))
b = 4 * (-1)
b = -4

Post by **Dare2** » Sat Sep 11, 2004 2:51 am

Depends how you evaluate PosVal - NegVal

Maybe

b = 4 * (2 - (3 - 4))
b = 4 * (2 - ( - 1 ))
b = 4 * (2 - - 1)
b = 4 * (3)
b = 12

Edit:

Ie, like signs always add and unlike always subtract

jack · Post by **jack** » Sat Sep 11, 2004 3:01 am

b = 4 * (2 - (3 - 4))
b = 4 * (2 - (1))
b = 4 * (-1)
b = -4

(3-4) --> -1
2-(-1)--> 3
4*3-->12

J. Baker · Post by **J. Baker** » Sat Sep 11, 2004 3:12 am

That still don't make sense.
3 - 4 = 1, now if it were 4 - 3, then it would be -1.
Also, 2 - (-1) is -3.

J. Baker · Post by **J. Baker** » Sat Sep 11, 2004 3:16 am

AHHHHH, I'm thinking backwards. LOL

blueznl · Post by **blueznl** » Sat Sep 11, 2004 6:33 am

b = 4 * (2 - (3 - 4))

b = 4 * ( 2 - ( -1 ) ) <=>
b = 4 * ( 2 + 1 ) <=>
b = 4 * 3 <=>
b = 12

Post by **Dare2** » Sun Sep 12, 2004 5:27 am

J. Baker wrote:AHHHHH, I'm thinking backwards. LOL

Hehe.

Big-Endian -v- Little-endian? or FIFO -v- LIFO?

J. Baker · Post by **J. Baker** » Sun Sep 12, 2004 5:51 am

LOL, I guess that'll happen when you get four hours sleep in fourty-eight hours. Oh well, it's not the first and probably won't be the last.

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