std::numeric_limits<T>::max (3) - Linux Manuals

std::numeric_limits<T>::max: std::numeric_limits<T>::max

NAME

std::numeric_limits<T>::max - std::numeric_limits<T>::max

Synopsis

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 UCHAR_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

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';
  }

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