Floating Point to Character Array?

[dougcoulter]

I have a real problem that is driving me crazy!

I have a floating point (4 bytes) variable that I need to convert into a 4 byte character array. I just want the raw data that makes up the 4 bytes of the float to be directly placed in the character array (no conversion or anything).

For example, if the floating point variable contains the number 22.625 ( = 0100 0001 1011 0101 0000 0000 0000 0000 ), I need a character array to be populated as

ch[0] = 0x41h = 0100 0001b
ch[1] = 0xB5h = 1011 0101b
ch[2] = 0x00h = 0000 0000b
ch[3] = 0x00h = 0000 0000b

Can anyone help me with the code required to accomplish this?

Thank you so much...

...Doug Coulter

 

[palbano]

memcpy will do the trick. The hard part is proving that it works. The following code provides the verification code as well.


char ch[4];
float f = 22.625;
memcpy( ch, &f, sizeof(f));

// now prove that 'ch' has the value by copying it into 'f2'
float f2 = 0.00;
memcpy( &f2, ch, sizeof(f));

TRACE("%f, %f\r\n", f, f2 );


Hope this helps
-pete

 

[dougcoulter]

That is exactly what I needed - thank you so much!

As pathetic as it seems, I have been trying to solve that problem for more than a day now! Based on the MSDN examples for memcpy, I thought it was only for use with character data types.

Thanks again!

Doug