What does 1e-12 mean?

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In Vincenty ellipsoidal formula I'm working on, there is a an expression: 1e-12

How do I convert that into code, Some source say it is equivalent to 10 power(-12) or is it e = 2.71828182

Posted 16-Apr-12 1:29am

Sumal.V

Updated 13-Aug-15 9:10am

Afzaal Ahmad Zeeshan

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nv3 16-Apr-12 7:32am

It is 10 to the -12th.

Albert Holguin 16-Apr-12 11:04am

You know, if you knew how to use a debugger, you could have answered this question yourself. Learn to use your debugger, it's a wonderful tool.

Sumal.V 16-Apr-12 11:16am

Do u mean running the program in debugger using breakpoints?????

Albert Holguin 16-Apr-12 11:42am

Yep, you could've just put a breakpoint and looked at what value was loaded onto a variable when you used that syntax.

Sumal.V 16-Apr-12 11:48am

Yeah I know what u mean. I mostly use debugger but my problem was to write this code itself.
Didn't know if it was e or 10.

RedDk 13-Aug-15 14:36pm

(sigh) ... provided you can get the thingamajig cell notation to display the thing in something without that "x0" value stuff ... (unsigh)

[no name] 13-Aug-15 16:01pm

He asked not a bad question! As the OP seems to know, e has also another meaning in math... and this "e" is f.... more older than any programming language!

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Jochen Arndt · Accepted Answer · 2012-04-16T01:47:00

Solution 1

It is the C/C++ notation for scientific numbers and can be read as 1 * 10^-12. Just use it this way in C++:

C++

double f = 1e-12;

Posted 16-Apr-12 1:47am

Jochen Arndt

Comments

Albert Holguin 16-Apr-12 11:03am

Pretty much all there is to it... +5

JackDingler 16-Apr-12 17:52pm

Yeah, and it can essentially be treated as zero. It's likely to be the result of a calculation that rounded off, and produced a small error.

It's not uncommon in graphics applications to round numbers out to some significant number of digits, for human readability, and to correct for some rounding errors.

Jochen Arndt 17-Apr-12 2:39am

It is the convergency limit for Vincenty's formula. See http://en.wikipedia.org/wiki/Vincenty%27s_formulae.

Afzaal Ahmad Zeeshan 13-Aug-15 15:09pm

5ed

Richard MacCutchan 14-Aug-15 2:50am

Look at the date of this question.

CPallini 13-Aug-15 16:09pm

5.

[no name] 13-Aug-15 16:21pm

Also my 5. Maybe you should have mention that also 1E-12 will be accepted... at least in C++..... which is from my Point of view "the more" correct Notation.