HUGE_VALF

From Cppreference

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Defined in header <cmath>
#define HUGE_VALF /*implementation defined*/

The HUGE_VALF macro expands to a positive float constant expression. It indicates that the value is not representable by the float type (infinity).

[edit] See also

HUGE_VAL	indicates value too big to be representable (infinity) by double (macro constant)
HUGE_VALL (C++11)	indicates value too big to be representable (infinity) by long double (macro constant)