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

std::numeric_limits<T>::max_exponent: std::numeric_limits<T>::max_exponent

NAME

std::numeric_limits<T>::max_exponent - std::numeric_limits<T>::max_exponent

Synopsis

static const int max_exponent; (until C++11)
static constexpr int max_exponent; (since C++11)

The value of std::numeric_limits<T>::max_exponent is the largest positive number n such that rn-1
, where r is std::numeric_limits<T>::radix, is a representable finite value of the floating-point type T.

Standard specializations

T value of std::numeric_limits<T>::max_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_MAX_EXP
double DBL_MAX_EXP
long double LDBL_MAX_EXP

Example

Demonstrates the relationships of max_exponent, max_exponent10, and max() for the type float:
// Run this code

  #include <iostream>
  #include <limits>
  int main()
  {
      std::cout << "max() = " << std::numeric_limits<float>::max() << '\n'
                << "max_exponent10 = " << std::numeric_limits<float>::max_exponent10 << '\n'
                << std::hexfloat
                << "max() = " << std::numeric_limits<float>::max() << '\n'
                << "max_exponent = " << std::numeric_limits<float>::max_exponent << '\n';
  }

Output:

  max() = 3.40282e+38
  max_exponent10 = 38
  max() = 0x1.fffffep+127
  max_exponent = 128