# Standard library header <cfloat>

From cppreference.com

This header was originally in the C standard library as

.
**<float.h>**

This header is part of the type support library, in particular it's part of the C numeric limits interface.

### [edit] Macros

FLT_RADIX |
the radix (integer base) used by the representation of all three floating-point types (macro constant) |

DECIMAL_DIG (C++11) |
number of decimal digits that can be converted to long double and back without losing precision (macro constant) |

FLT_MIN DBL_MIN LDBL_MIN |
minimum value of float, double and long double respectively (macro constant) |

FLT_MAX DBL_MAX LDBL_MAX |
maximum value of float, double and long double respectively (macro constant) |

FLT_EPSILON DBL_EPSILON LDBL_EPSILON |
difference between 1.0 and the next representable value for float, double and long double respectively (macro constant) |

FLT_DIG DBL_DIG LDBL_DIG |
number of decimal digits that can be represented without losing precision for float, double and long double respectively (macro constant) |

FLT_MANT_DIG DBL_MANT_DIG LDBL_MANT_DIG |
number of base `FLT_RADIX` digits that can be represented without losing precision for float, double and long double respectively (macro constant) |

FLT_MIN_EXP DBL_MIN_EXP LDBL_MIN_EXP |
minimum negative integer such that `FLT_RADIX` raised by power one less than that integer is a normalized float, double and long double respectively (macro constant) |

FLT_MIN_10_EXP DBL_MIN_10_EXP LDBL_MIN_10_EXP |
minimum negative integer such that 10 raised by power one less than that integer is a normalized float, double and long double respectively (macro constant) |

FLT_MAX_EXP DBL_MAX_EXP LDBL_MAX_EXP |
maximum positive integer such that `FLT_RADIX` raised by power one more than that integer is a normalized float, double and long double respectively (macro constant) |

FLT_MAX_10_EXP DBL_MAX_10_EXP LDBL_MAX_10_EXP |
maximum positive integer such that 10 raised by power one more than that integer is a normalized float, double and long double respectively (macro constant) |

default rounding mode of floating-point arithmetics (macro constant) | |

(C++11) |
specifies in what precision all arithmetic operations are done (macro constant) |