std::numeric_limits<T>::max_exponent10

 

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static const int max_exponent10;		(until C++11)
static constexpr int max_exponent10;		(since C++11)

See More

The value of std::numeric_limits<T>::max_exponent10 is the largest positive number n such that \(\scriptsize 10^n\)10n
is a representable finite value of the floating-point type T.

Standard specializations

T	value of std::numeric_limits<T>::max_exponent10
/* non-specialized */	0
bool	0
char	0
signed char	0
unsigned char	0
wchar_t	0
char8_t (since C++20)	0
char16_t (since C++11)	0
char32_t (since C++11)	0
short	0
unsigned short	0
int	0
unsigned int	0
long	0
unsigned long	0
long long (since C++11)	0
unsigned long long (since C++11)	0
float	FLT_MAX_10_EXP
double	DBL_MAX_10_EXP
long double	LDBL_MAX_10_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 << '\n'
              << "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

See also

max_exponent [static]	one more than the largest integer power of the radix that is a valid finite floating-point value (public static member constant)
min_exponent [static]	one more than the smallest negative power of the radix that is a valid normalized floating-point value (public static member constant)
min_exponent10 [static]	the smallest negative power of ten that is a valid normalized floating-point value (public static member constant)