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QNaN

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I need a way, in C, to use the float QNaN value directly. In other words, how could I define QNAN in this example?
  
float a = QNAN;
int b;

b = ( a != QNAN );
  
This works, but seems kludgy:
  
#define QNAN   GetQNAN()

float GetQNAN(void)
{
    unsigned int b = 0xfff80000; // hex representation of QNaN

    return *(float*)(&b);
}
  
I read about something in C++ called reinterpret_cast that looked like it might have been useful, but again, I''m looking for a C solution. Any suggestions are appreciated!

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