std::numeric_limits<T>::max
From cppreference.com
< cpp | types | numeric limits
| Defined in header <limits>
|
||
| static T max() throw(); |
(until C++11) | |
| static constexpr T max() noexcept; |
(since C++11) | |
Returns the maximum finite value representable by the numeric type T. Meaningful for all bounded types.
Return value
T
|
std::numeric_limits<T>::max() |
| /* non-specialized */ | T()
|
| bool | true |
| char | CHAR_MAX |
| signed char | SCHAR_MAX |
| unsigned char | UCHAR_MAX |
| wchar_t | WCHAR_MAX |
| char8_t (C++20) | UCHAR_MAX |
| char16_t (C++11) | UINT_LEAST16_MAX |
| char32_t (C++11) | UINT_LEAST32_MAX |
| short | SHRT_MAX |
| unsigned short | USHRT_MAX |
| int | INT_MAX |
| unsigned int | UINT_MAX |
| long | LONG_MAX |
| unsigned long | ULONG_MAX |
| long long (C++11) | LLONG_MAX |
| unsigned long long (C++11) | ULLONG_MAX |
| float | FLT_MAX |
| double | DBL_MAX |
| long double | LDBL_MAX |
Example
Demonstrates the use of max() with some fundamental types and some standard library typedefs (the output is system-specific)
Run this code
#include <limits> #include <cstddef> #include <iostream> int main() { std::cout << "short: " << std::dec << std::numeric_limits<short>::max() << " or " << std::hex << std::showbase << std::numeric_limits<short>::max() << '\n' << "int: " << std::dec << std::numeric_limits<int>::max() << " or " << std::hex << std::numeric_limits<int>::max() << '\n' << std::dec << "streamsize: " << std::dec << std::numeric_limits<std::streamsize>::max() << " or " << std::hex << std::numeric_limits<std::streamsize>::max() << '\n' << "size_t: " << std::dec << std::numeric_limits<std::size_t>::max() << " or " << std::hex << std::numeric_limits<std::size_t>::max() << '\n' << "float: " << std::numeric_limits<float>::max() << " or " << std::hexfloat << std::numeric_limits<float>::max() << '\n' << "double: " << std::defaultfloat << std::numeric_limits<double>::max() << " or " << std::hexfloat << std::numeric_limits<double>::max() << '\n'; }
Possible output:
short: 32767 or 0x7fff int: 2147483647 or 0x7fffffff streamsize: 9223372036854775807 or 0x7fffffffffffffff size_t: 18446744073709551615 or 0xffffffffffffffff float: 3.40282e+38 or 0x1.fffffep+127 double: 1.79769e+308 or 0x1.fffffffffffffp+1023
See also
| [static] (C++11) |
returns the lowest finite value of the given type (public static member function) |
| [static] |
returns the smallest finite value of the given type (public static member function) |