what is the meaning of "e" in "double freq = 914.0e6; // frequency"

er.poojasahu@gmail.com · 12-16-2013, 12:06 AM

In the following statement used for defining frequency in Hz, what is the meaning of "e"

"double freq = 914.0e6; // frequency"

pan64 · 12-16-2013, 12:41 AM

would be nice to know at least the language you use.
In general it is called scientific notation, and you can use google to look for a lot of examples, explanations...
http://office.microsoft.com/en-us/ex...003064132.aspx

knudfl · 12-17-2013, 01:44 AM

Code:

	double freq = 914.0e6;         // frequency

.... that's line 164 from ns-2.xx/indep-utils/propagation/threshold.cc

I'd guess that `914.0e6' is some kind of binary value of "frequency" ?
See post #2 : "scientific notation".

Similar figures can be used in ns2 also for distance / radius.
Example from the file zrp-Demo1-100m.tcl , line 17 :
Agent/ZRP set radius_ 1.42681e-08 ;# Setting ZRP radius : distance 100 meters

Other example with "914.0e6" (ns2 / Matlab) :
https://wiki.ti5.tu-harburg.de/wsn/ns2/plot_shadowing

@er.poojasahu@gmail.com : Please read this ..
http://www.linuxquestions.org/linux/...Ask_a_Question
http://linuxsilo.net/docs/smart-questions_en.html

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er.poojasahu@gmail.com · 12-17-2013, 01:57 AM

I got the meaning

Its...914.0 X 10^6 which is 914 MHz frequency