About Conversion java better then Visual C++???

Good Morning,

I am using Visual C++ 6 and I need to convert a double in to a string in order to assign its value to a specified variable that is a string.

I know that in C++ there is a function call:
_ecvt()

that converts a double in to a string but delete the comma and the sign!

x=-3.14 becames str = 314.

I know also that in Java there is a function:

Double.toString()

that does exactly what i would like!
I cannot believe that in C++ there is not a function like that!
I think i would have to create it!

What do you think?

Thank you
Dado