std::numeric_limits<T>::min_exponent (3) - Linux Manuals

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

NAME

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