# std::numeric_limits<T>::max

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< 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 (since C++20) | UCHAR_MAX
char16_t (since C++11) | UINT_LEAST16_MAX
char32_t (since 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 (since C++11) | LLONG_MAX
unsigned long long (since 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 <cstddef>
    #include <iostream>
    #include <limits>
    #include <string_view>
    #include <type_traits>

    template<typename T>
    void print_max_twice(std::string_view type)
    {
        constexpr T max_value {std::numeric_limits<T>::max()};

        std::cout << type << ": ";
        if constexpr (std::is_floating_point_v<T>)
            std::cout << std::defaultfloat << max_value << " or "
                      << std::hexfloat << max_value << '\n';
        else
            std::cout << std::dec << static_cast<unsigned long long>(max_value) << " or "
                      << std::hex << static_cast<unsigned long long>(max_value) << '\n';
    }

    int main()
    {
        std::cout << std::showbase;

        print_max_twice<bool>("bool");
        print_max_twice<short>("short");
        print_max_twice<int>("int");
        print_max_twice<std::streamsize>("streamsize");
        print_max_twice<std::size_t>("size_t");
        print_max_twice<char>("char");
        print_max_twice<char16_t>("char16_t");
        print_max_twice<wchar_t>("wchar_t");
        print_max_twice<float>("float");
        print_max_twice<double>("double");
        print_max_twice<long double>("long double");
    }

Possible output:

    bool: 1 or 0x1
    short: 32767 or 0x7fff
    int: 2147483647 or 0x7fffffff
    streamsize: 9223372036854775807 or 0x7fffffffffffffff
    size_t: 18446744073709551615 or 0xffffffffffffffff
    char: 127 or 0x7f
    char16_t: 65535 or 0xffff
    wchar_t: 2147483647 or 0x7fffffff
    float: 3.40282e+38 or 0x1.fffffep+127
    double: 1.79769e+308 or 0x1.fffffffffffffp+1023
    long double: 1.18973e+4932 or 0xf.fffffffffffffffp+16380

### See also

lowest [static] (C++11) | returns the lowest finite value of the given type (public static member function)
min [static] | returns the smallest finite value of the given type (public static member function)

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