Double <-> *char (Hex) 1

[chpicker]

I work mainly with Visual FoxPro which is a VERY high-level language. I am familiar (I use the term loosely) with the structure of C/C++, but I just can't for the life of me figure out how to program for Windows. *sigh*

In any case, I have a need to convert 64-bit doubles stored in a data file to their decimal equivalents and back. While I've had great luck using UNIONs to combine a double with an __int64 and using printf(), this only gives the illusion of conversion. Using this method, I was able to construct a data file by hand by hard-coding the numbers to convert. I can't do them by hand anymore.

I need to create two functions: one that will take a DOUBLE and return a hex string as a *char, and one that will take a *char (8 2-character bytes+null terminator, total length 17) and return the DOUBLE that it represents. Any suggestions?

Ian

 

[tchouch]

char buffer[30];
double X;
_gcvt( X, 14, buffer ); //In buffer You have Your string
double Y = atof(buffer ); //You have Your double in Y now

 

[chpicker]

Thanks...that points me in the right direction!

Ian