std::numeric_limits::max

From cppreference.com
 
 
 
Type support
Basic types
Fundamental types
Fixed width integer types (C++11)
Numeric limits
C numeric limits interface
Runtime type information
Type traits
Primary type categories
(C++11)
(C++14)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
Type properties
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++14)
(C++11)
Supported operations
Relationships and property queries
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
Type modifications
(C++11)(C++11)(C++11)
(C++11)(C++11)(C++11)
(C++11)
(C++11)
Type transformations
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
Type trait constants
 
 
static T max();
(until C++11)
static constexpr T max();
(since C++11)

Returns the maximum finite value representable by the numeric type T. Meaningful for all bounded types.

Contents

[edit] 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
char16_t UINT_LEAST16_MAX
char32_t 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 LLONG_MAX
unsigned long long ULLONG_MAX
float FLT_MAX
double DBL_MAX
long double LDBL_MAX

[edit] Exceptions

(none) (until C++11)
noexcept specification:  
noexcept
  
(since C++11)

[edit] Example

Demonstrates the use of max() with some fundamental types and some standard library typedefs (the output is system-specific)

#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';
}

Output:

short: 32767 or 0x7fff
int: 2147483647 or 0x7fffffff
size_t: 18446744073709551615 or 0xffffffffffffffff
streamsize: 9223372036854775807 or 0x7fffffffffffffff
float: 3.40282e+38 or 0x1.fffffep+127
double: 1.79769e+308 or 0x1.fffffffffffffp+1023

[edit] 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)