Convert double to *chart

[wakeup]

I want convert double to char * string for insert in a .ini file

char mystring[50];
double mydouble;

sprintf(mystring, "%f", mydouble);

It runs ok, but when I have a very small double (for example
0.000000000000000000000000001)
It convert to 0.00000000 (=0) and not to 1.0e-20
Do you know how solve it?
Thanks

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[Danny]

try to specify higher precision, say "%30.28f" which means 30 digits, 28 of which are for the fraction.

[wakeup]

Thanks it is better but, I would like it puts something as 1.3e-20, is this posible?
Thankss

[Danny]

yes, use the %e or %E format flags instead of %f.

[wakeup]

This is the solucion "%e" in cientific mode
Thanks

[Danny]

btw, you want to initialize your buffer before using it:

char mystring[50] = {0};
...