String formatting for QString::number()

[Swati777999]

Hi All,

I want to convert a float value to scientific notation [with 3 decimal places ]for example 8.3562456 = 83562.456e-4
Can it be possible with

Case-1:

double num = 8.3562456 ;// user input
int deci_pl = 3 ;// user input
QString fin_val = QString::number(num,'e',deci_pl); 

Case-2:

double num=8.3562456 ;// user input
int deci_pl = 3 ;// user input
QString fin_val = QString::number(num,'f',deci_pl); 

Which one of the two methods, will you suggest for this conversion?

[JonB]

@Swati777999
I think e notation always puts in an e[+-]num while f will only do so if the number is big or small? Did you try them to see?

UPDATE
Sorry, I mixed up f with g format. f format will not apparently ever use e[+-]num format. The various formats and their output are listed at https://doc.qt.io/qt-5/qstring.html#argument-formats, and you can try them out, so why not do so?