[Dev-C++] precision problem

[<cg...@wo...>]

  At the end I achieved to make it work. With my own function, 
setprecision(n) and setiosflags(ios::fixed).
Then I tried with the code using the standard functions and the result 
was the same, as it would be expected.

I don't understand the reason for this, that setprecision doesn't affect 
the precision, and is ios::fixed which really affect it (although 
perhaps it would need setprecision be set before). But I understand that 
if I set the precission to 6, e.g, I want to print all the significants 
numbers till the sixth decimal, and with exact precission, so if it sees 
the number 175.240236845 it will print the six decimals, having so 
175.240237, but I don't want it to cut the number in its second decimal, 
giving 175.24, or adjusting from the third and leaving the rest being 
wrong, as seeing 54.2548245 and give 54.255387. That shall be the 
mission of setprecision, the ios::fixed is for displaying not 
significant 0s till reaching the total of decimals especified by the 
precision option, so with number 2.24504800000  being this:

setprecision[p](9) ios::fixed[f] not defined:
2.245048
p(2) f not
2.25
p(9) f yes
2.245048000
p(2) f yes
2.251558745