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Bang in C

Name: Anonymous 2010-09-25 23:57

unsigned x = 1
((!!x)<<31>>31 produces -1
I just learned that bang causes unsigned values to be interpreted as signed values, anyone know the reasoning behind this?

Name: Anonymous 2010-09-25 23:58

bang?

Name: Anonymous 2010-09-26 0:02

See §6.5.3.3 clause 5 of ISO/IEC 9899:TC2.

Name: Anonymous 2010-09-26 0:05

You should read Expert C Programming, which speaks at length about type conversion, among other things.

http://books.google.co.uk/books?id=9t5uxP9xHpwC&pg=PA26&dq=signed+floatiest&hl=en&ei=C8aeTKquDt3NjAfs0dSVDQ&sa=X&oi=book_result&ct=result&resnum=1&ved=0CC8Q6AEwAA

Name: Anonymous 2010-09-26 0:08

Is there a reason why you used two hoinkys?

Name: Anonymous 2010-09-26 0:09

>>5

That's what she said! LOLOLOL

Name: Anonymous 2010-09-26 0:10

>>6

Hoinky 6!

Name: Anonymous 2010-09-26 1:41

>>4
Please stop giving terrible advice.

Name: Anonymous 2010-09-26 6:12

>>1
Because they had no _Bool yet in their first C compiler. So they decided "why not?"

Name: Anonymous 2010-09-26 10:16

>>8
Never!

Name: Anonymous 2010-12-21 7:16

Don't change these.

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Entire Thread Thread List

Bang in C

1 Name: Anonymous 2010-09-25 23:57

2 Name: Anonymous 2010-09-25 23:58

3 Name: Anonymous 2010-09-26 0:02

4 Name: Anonymous 2010-09-26 0:05

5 Name: Anonymous 2010-09-26 0:08

6 Name: Anonymous 2010-09-26 0:09

7 Name: Anonymous 2010-09-26 0:10

8 Name: Anonymous 2010-09-26 1:41

9 Name: Anonymous 2010-09-26 6:12

10 Name: Anonymous 2010-09-26 10:16

11 Name: Anonymous 2010-12-21 7:16