HUGE_VALF
From cppreference.com
                    
                                        
                    
                    
                                                            
                    |   Defined in header <math.h>
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|   #define HUGE_VALF /*implementation defined*/  | 
(since C99) | |
|   #define HUGE_VAL  /*implementation defined*/  | 
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|   #define HUGE_VALL /*implementation defined*/  | 
(since C99) | |
The HUGE_VALF, HUGE_VAL and HUGE_VALL macros expands to a positive floating point constant expression.
| Constant | Explanation | 
| HUGE_VALF | Indicates that the value is not representable by the float type (infinity) | 
| HUGE_VAL |   Indicates that the value is not representable by the double type (infinity). The constant is not necessarily representable as a float  | 
| HUGE_VALL |   Indicates that the value is not representable by the long double type (infinity). The constant is not necessarily representable as a float or double  | 
[edit] See also
|   C++ documentation for HUGE_VAL 
 |