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Unknown problem

Hi folks,
I have tried the following source code and it seemed not behaving what I was expected

 
#define Const1 (10)
#define Const2 (Const1/4096)
#define Base (2850)

unsigned int g_wData;
float g_fA = Base;
float g_fB = Base;

u8 IsChanged(void)
{ 
  g_fA = Base + (Const2 *g_wData);
   /*if the two value are the same,just return 0*/
   /*else return 1 and assign the new value to...*/
   if(g_fA == g_fB )
   {
	return (0);
   }
   g_fB =  g_fA ;
   return (1);
}

Algorithm:
Two float point global variables to hold some sort of decimal values.
The content of unsigned integer Data changes some where in the program dynamically.
This function always return (0) even though the g_wData value changes.
Do anybody have any suggestion(s)?

P.S. I have make the g_wData variable volatile, and it didn't help.