A simple question??

Dear all,

  I'm currently use R v0.99 on Windows 98 Second Edition. I have a =
question on some simple calculations. I wonder that I've done something =
wrong with the calculation.
Here is the imput commands:

a <- 25.01
b <- 56.08
a.trunc <- trunc(a)
b.trunc <- trunc(b)
a.tail <- a - a.trunc
b.tail <- b - b.trunc
a.trunc

[1] 25

b.trunc

[1] 56

a.tail

[1] 0.01

b.tail

[1] 0.08

a.tail <- (a - a.trunc) * 100
b.tail <- (b - b.trunc) * 100
a.tail

[1] 1

b.tail

[1] 8

N <- ( (b.trunc - a.trunc) * 12 ) + (b.tail - a.tail)
N

[1] 379

N == 379

[1] FALSE

According to the above command and output, the value of N is equal to 
379, but when I set the condition 'N =3D=3D 379' R gives "FALSE" as the 
result. How do I avoid this problem?? I do the same thing in S-plus 4.0 
release 3 on Win98 SE and obtained the same result.

I look forward to hear your reply.

abs(N - 379)