Oh Fortran, how I love thee.

Fortran's logical operators that operate on integers happen to be bitwise. I didn't care about this until now. Here's a summary for two integers, a and b, which can take values 0 or 1.

logical AND:

(ab)	iand(a,b)
00	0
01	0
10	0
11	1

logical OR:

(ab)	ior(a,b)
00	0
01	1
10	1
11	1

logical XOR:

(ab)	ieor(a,b)
00	0
01	1
10	1
11	0

logical NOT:

(a)	not(a)
0	-1
1	-2

WTF? I have been bitten by the bitwise bear! In order to get zeros and ones, I must use ieor(1,a) instead of not(a). Pah.

Also, the tables in this post look all shit in my browser but I can't be bothered to fix them when I have Fortran to do instead.

Today's post was brought to you by the numbers 0 and 1 and the letter F.