INFINITY

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Defined in header <math.h>
#define INFINITY /*implementation defined*/
(since C99)

If the implementation supports floating-point infinities, the macro INFINITY expands to constant expression of type float which evaluates to positive or unsigned infinity.

If the implementation does not support floating-point infinities, the macro INFINITY expands to a positive value that is guaranteed to overflow a float at compile time, and the use of this macro generates a compiler warning.

[edit] See also

(C99)
checks if the given number is infinite
(function)
indicates value too big to be representable (infinity) by float, double and long double respectively
(macro constant)
C++ documentation for INFINITY