How to use string to format cstring in C ++?

That is, the following functions are implemented:

1 Cstring STR;
2 Double D =   10.24 ;
3 Str. Format ( " D = %. 2f " , 10.24 );

In fact, using the C ++ standard library is also relatively simple,CodeAs follows:

# Include < Sstream >
Using   Namespace STD;

..
Ostringstream Buf;
Double D =   10.24 ;
Buf < " D = " < D < Endl;

Buf. STR () is a string of the string type whose content is "d = 10.24.

Through comparison, it is found that the implementation is relatively simple, and the standard library is used for implementation, and the code is easy to transplant. Personal comparison is recommended.