std::numeric_limits::min_exponent (3) Linux Manual Page

std::numeric_limits<T>::min_exponent – std::numeric_limits<T>::min_exponent

Synopsis

static const int min_exponent;
(until C++ 11)

    static constexpr int min_exponent;
(since C++ 11)

The value of std::numeric_limits<T>::min_exponent is the lowest negative number n such that rn-1
, where r is std::numeric_limits<T>::radix, is a valid normalized value of the floating-point type T.

Standard specializations

T value of std::numeric_limits<T>::min_exponent
/* non-specialized */ 0
bool 0
char 0
signed char 0
unsigned char 0
wchar_t 0
char8_t 0
char16_t 0
char32_t 0
short 0
unsigned short 0
int 0
unsigned int 0
long 0
unsigned long 0
long long 0
unsigned long long 0
float FLT_MIN_EXP
double DBL_MIN_EXP
long double LDBL_MIN_EXP

Example

Demonstrates the relationships of min_exponent, min_exponent10, min, and radix for the type float:
// Run this code

#include <iostream>

int main()

{
    std::cout << "min() = " << std::numeric_limits<float>::min() << '\n'
              << "min_exponent10 = " << std::numeric_limits<float>::min_exponent10 << '\n'
              << std::hexfloat
              << "min() = " << std::numeric_limits<float>::min() << '\n'
              << "min_exponent = " << std::numeric_limits<float>::min_exponent << '\n';
}

Output:

  min() = 1.17549e-38
  min_exponent10 = -37
  min() = 0x1p-126
  min_exponent = -125

See also

radix the radix or integer base used by the representation of the given type
               (public static member constant)
[static]
min_exponent10 the smallest negative power of ten that is a valid normalized floating-point value
               (public static member constant)
[static]
max_exponent one more than the largest integer power of the radix that is a valid finite floating-point value
               (public static member constant)
[static]
max_exponent10 the largest integer power of 10 that is a valid finite floating-point value
               (public static member constant)
[static]