newbie question : about the perl sprintf
Hi, all ; I want to print this sentence " The number in scientific notation is 1.255000e+02". So I write a perl script like this : #!/usr/bin/perl sprintf "The number in scientific notation is %e", 1.255; But the screen output is "The number in scientific notation is 1.255000e+00" And I modify it like this "sprintf "The number in scientific notation is %e", 01.255;" The screen now output is " The number in scientific notation is 1.255000e+03" I don't know how I can display the correct answer . Please forgive me if this is a very simple question on Perl . I am a Perl newbie ~~~ Thanks ~~~
Re: newbie question : about the perl sprintf
At 8:52 PM +0800 10/21/09, Majian wrote: Hi, all ; I want to print this sentence " The number in scientific notation is 1.255000e+02". So I write a perl script like this : #!/usr/bin/perl sprintf "The number in scientific notation is %e", 1.255; But the screen output is "The number in scientific notation is 1.255000e+00" I don't get anything when I execute that line. You must have used the printf function in your actual code. 1.255000e+00 is the correct scientific representation of the number 1.255. If you want to print 1.255000e+02, then you should print the number 125.5. -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Re: newbie question : about the perl sprintf
> > sprintf "The number in scientific notation is %e", 1.255; > Sprintf doesn't print actually, it just returns a string based on the formats provided in the list you have. To actually print something you should use printf. printf "The number in scientific notation is %e",1255; And the notation 1.255000e+03 is right as the output since it means 1.255000 * (10^3), so 1.255 * 1000 = 1255. (as Jim already said) Att. Christian Bernini
Re: newbie question : about the perl sprintf
On 21 Okt, 14:52, jian...@gmail.com (Majian) wrote:
> Hi, all ;
>
> I want to print this sentence " The number in scientific
> notation is 1.255000e+02".
>
> So I write a perl script like this :
> #!/usr/bin/perl
> sprintf "The number in scientific notation is %e", 1.255;
> But the screen output is "The number in scientific notation is
> 1.255000e+00"
>
> And I modify it like this "sprintf "The number in scientific
> notation is %e", 01.255;"
> The screen now output is " The number in scientific notation
> is 1.255000e+03"
>
> I don't know how I can display the correct answer .
>
> Please forgive me if this is a very simple question on Perl . I am a
> Perl newbie ~~~
>
> Thanks ~~~
#!/usr/bin/perl
printf("The number in scientific notation is %e\n", 125.55);
Gives The number in scientific notation is 1.255500e+002
I test to enter the result you are looking for as
perl -42 de now ju can test single line of Perl kode
heter i enter print 1.255500e+02
( CTRL-Z) takes you out, (att least in WIndows version of PERL)
You can read more about formating data in this link
http://perldoc.perl.org/functions/sprintf.html
Best regards
Anders
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Re: newbie question : about the perl sprintf
On Wed, 21 Oct 2009 20:52:05 +0800, Majian wrote: > And I modify it like this "sprintf "The number in > scientific > notation is %e", 01.255;" > The screen now output is " The number in scientific > notation > is 1.255000e+03" Ha, this is an interesting case. By putting the zero before the 1, it turns it into an octal number and now the period becomes the concatenation operator instead of a decimal point, yielding a term of 1255. Try printf "The number in scientific notation is %e", 037.255"; and see what happens. -- Peter Scott http://www.perlmedic.com/ http://www.perldebugged.com/ http://www.informit.com/store/product.aspx?isbn=0137001274 -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Re: newbie question : about the perl sprintf
I found these : perl -e'print 01.234 + 01.234', "\n"' perl -e'print 01.234 + 011.234' "\n"' perl -e'print 01.234.12 + 01.234', "\n"' And the results were : 1235234 1235234 1235.12234 Can someone explain it ? Thanks~~ On Sat, Oct 24, 2009 at 7:28 PM, Peter Scott wrote: > On Wed, 21 Oct 2009 20:52:05 +0800, Majian wrote: > > And I modify it like this "sprintf "The number in > > scientific > > notation is %e", 01.255;" > > The screen now output is " The number in scientific > > notation > > is 1.255000e+03" > > Ha, this is an interesting case. By putting the zero before the 1, it > turns it into an octal number and now the period becomes the concatenation > operator instead of a decimal point, yielding a term of 1255. > > Try printf "The number in scientific notation is %e", 037.255"; and see > what happens. > > -- > Peter Scott > http://www.perlmedic.com/ > http://www.perldebugged.com/ > http://www.informit.com/store/product.aspx?isbn=0137001274 > > -- > To unsubscribe, e-mail: beginners-unsubscr...@perl.org > For additional commands, e-mail: beginners-h...@perl.org > http://learn.perl.org/ > > >
Re: newbie question : about the perl sprintf
2009/10/25 Majian : > I found these : > perl -e'print 01.234 + 01.234', "\n"' print (01).(234+01).234, "\n"; this evaluates to '1'.'235'.'234' > perl -e'print 01.234 + 011.234' "\n"' I didn't get 1235234, I got 1243234. print (01).(234+011).(234),"\n" evaluates to print '1'.(234+9).'234',"\n"; evaluates to print '1'.'243'.'234',"\n"; > perl -e'print 01.234.12 + 01.234', "\n"' I'll let you work this one out as an exercise. The key point is that you can't have decimal octal numbers, so the . operator is interpreted as the string concatenation operator. Phil -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Re: newbie question : about the perl sprintf
Majian wrote: I found these : perl -e'print 01.234 + 01.234', "\n"' perl -e'print 01.234 + 011.234' "\n"' perl -e'print 01.234.12 + 01.234', "\n"' And the results were : 1235234 1235234 1235.12234 For other surprises, try also: perl -wle 'print length(01.234.12)' perl -wle 'print 01.234.12' perl -wle 'print length(1.234.12)' perl -wle 'print length(0+1.234.12)' -- Ruud -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
