uncertain results from "printf" with "%g"

[lehe]

Hi,
When using "..printf Functions" with Conversion specifier type "%g", it gives different results under different environment. For example, "sprintf(string,"%g",1e-6);" gives "1e-006" in Windows (Visual C++) and "1e-06" in Linux (gcc). Maybe I am wrong about it. Is it possible to get the same format under whatever operating system or compiler?
Thanks in advance!

 

[cpjust]

%g lets the implementation choose whatever format it thinks it best.

http://www.cppreference.com/stdio/printf.html

Use the size specifiers to tell it how many digits you want before and after the decimal point.
Ex. printf( "%1.3g", 3.1415 );
should print: "3.141

 

[ArkM]

None the less you can't control number of digits or + sign occurence after E (or e) in such manner (when %g treated as %e). So it's and will be implementation-defined issue.

Apropos, is it a good style - to post the answer to several forums at the same time?

http://www.daniweb.com/forums/thread136808.html

 

[xwb]

Also, if you decide to change to f format, remember that the n.m in a %g and the n.m in a %f are interpreted differently.