int((9.2-9.0)*10) is 1, int((9.21-9.0)*10) is 2, why?

[bcm]

Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit
(Intel)] on win32
The following line of code describes an funny question$B!'( B

>>int((9.2-9.0)*10)

1

>>int((9.21-9.0)*10)

2

>>int((9.1-9.0)*10)

0

>>int((9.11-9.0)*10)

1

>>int((8.2-8.0)*10)

1

>>int((8.23-8.0)*10)

2

why? anybody can explain it?

[John Machin]

Re: int((9.2-9.0)*10) is 1, int((9.21-9.0)*10) is 2, why?

On Sep 5, 11:12 pm, bcm <bluecrysta...@ gmail.comwrote:

Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit
(Intel)] on win32
The following line of code describes an funny question$B!'( B>>int((9.2-9.0)*10)
1

>int((9.21-9.0)*10)

2

>int((9.1-9.0)*10)

0

>int((9.11-9.0)*10)

1

>int((8.2-8.0)*10)

1

>int((8.23-8.0)*10)

>
2
>
why? anybody can explain it?

Try looking one step at a time:

>>9.2

9.1999999999999 993

That wasn't hard, was it? Do you need any further explanation? If so,
look here:

http://docs.python.org/tut/node16.html

[bcm]

Re: int((9.2-9.0)*10) is 1, int((9.21-9.0)*10) is 2, why?

On Sep 5, 9:29 pm, John Machin <sjmac...@lexic on.netwrote:

On Sep 5, 11:12 pm, bcm <bluecrysta...@ gmail.comwrote:
>
>
>

Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit
(Intel)] on win32
The following line of code describes an funny question$B!'( B>>int((9.2-9.0)*10)
1

>>int((9.21-9.0)*10)

2

>>int((9.1-9.0)*10)

0

>>int((9.11-9.0)*10)

1

>>int((8.2-8.0)*10)

1

>>int((8.23-8.0)*10)

>

2

>

why? anybody can explain it?

>
Try looking one step at a time:>>9.2
>
9.1999999999999 993
>
That wasn't hard, was it? Do you need any further explanation? If so,
look here:http://docs.python.org/tut/node16.html

thanks a lot, i am really really stupid ~*v*~