std::numeric_limits<T>::max_exponent10

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

The value of std::numeric_limits<T>::max_exponent10 is the largest positive number n such that 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`	`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_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:

#include <iostream>
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

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)

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std::numeric_limits<T>::max_exponent10

Standard specializations

Example

See also