static const int radix; | (until C++11) | |

static constexpr int radix; | (since C++11) |

The value of `std::numeric_limits<T>::radix`

is the base of the number system used in the representation of the type. It is `2`

for all binary numeric types, but it may be, for example, `10`

for IEEE 754 decimal floating-point types or for third-party binary-coded decimal integers. This constant is meaningful for all specializations.

`T` | value of `std::numeric_limits<T>::radix` |
---|---|

/* non-specialized */ | `0` |

bool | `2` |

char | `2` |

signed char | `2` |

unsigned char | `2` |

wchar_t | `2` |

char8_t (since C++20) | `2` |

char16_t (since C++11) | `2` |

char32_t (since C++11) | `2` |

short | `2` |

unsigned short | `2` |

int | `2` |

unsigned int | `2` |

long | `2` |

unsigned long | `2` |

long long (since C++11) | `2` |

unsigned long long (since C++11) | `2` |

float | `FLT_RADIX` |

double | `FLT_RADIX` |

long double | `FLT_RADIX` |

[static] | number of `radix` digits that can be represented without change (public static member constant) |

[static] | one more than the smallest negative power of the radix that is a valid normalized floating-point value (public static member constant) |

[static] | one more than the largest integer power of the radix that is a valid finite floating-point value (public static member constant) |

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https://en.cppreference.com/w/cpp/types/numeric_limits/radix