Re^3: ' or no?

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Re^4: ' or no? by xiaoyafeng (Deacon) on Dec 28, 2006 at 05:02 UTC
I see. perl stored all numbers in decimal background. right? In other word, oct and hex is needless. We could use print to replace them. maybe it's TIMTOWTDI. :)	[reply]
Re^5: ' or no? by BrowserUk (Patriarch) on Dec 28, 2006 at 05:14 UTC
You are evidently misunderstanding the explanations being provided. Perhaps the language is a barrier. Take a look here, the diagrams + explanation may clarify things for you. Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. "Science is about questioning the status quo. Questioning authority". In the absence of evidence, opinion is indistinguishable from prejudice. "Too many [] have been sedated by an oppressive environment of political correctness and risk aversion."	[reply]
Re^5: ' or no? by xiaoyafeng (Deacon) on Dec 28, 2006 at 11:33 UTC
Thanks all gurus! I admit language is a barrier to communicate with monks,especially for a perl beginner:) why `print oct(0xff); # 173` [download] ? because oct function require a "string" parameter,So perl convert(stealthily) 0xff(number) to 255(string),then oct convert 255(octal) to 173(decimal). right?I hopefully don't misunderstand reply being provided. But you have to admit it's a trap to a beginner.Although I add "use warnings" and" use strict",perl don't give any useful messages.It just return 173. For me,I prefer to choose print(printf): `my $num = 0xff; print oct($num); #wrong! printf('xo',$num);# right!` [download] p.s. maybe I can use pack,but it's another issue.	[reply] [d/l] [select]
Re^6: ' or no? by ikegami (Patriarch) on Dec 28, 2006 at 18:07 UTC
`oct` converts from oct/hex/bin (oct in your case). Conversion from dec is done automatically when needed. `printf` converts to dec/oct/hex/bin. `>perl -le "printf '%d', '255' 255 >perl -le "printf '0%o', oct '0377' 0377 >perl -le "printf '0x%X', oct '0xFF' 0xFF >perl -le "printf '0b%b', oct '0b11111111' 0b11111111` [download]	[reply] [d/l] [select]
Re^5: ' or no? by ysth (Canon) on Dec 28, 2006 at 05:39 UTC
How "use print to replace them"? If you have a file that has "0xdeadbeef" stored in it, and you want to read it in and show what the decimal equivalent is, you use oct or hex. print doesn't do that. Again, oct is for converting strings containing a number formatted in hex, octal, or binary into something perl can use as a number.	[reply]
Re^5: ' or no? by ikegami (Patriarch) on Dec 28, 2006 at 06:17 UTC
Decimal is a string representation of a number, so no. The number is stored in the machine's native format for signed integers and/or the machine's native format for real numbers. Note: The decimal representation of a number is sometimes present in the scalar for efficiency reasons. However, that's only used when the number needs to be converted to a string and not when doing any type of mathematical operation.	[reply]