C-Schnittstelle für numerische Grenzen

#include <climits>
#include <cstdint>
#include <iomanip>
#include <iostream>
#include <locale>

int main()
{
    constexpr int w = 14;
    (std::cout << std::left).imbue(std::locale("en_US.UTF-8"));
#   define COUT(x) std::cout << std::setw(w) << #x << " = " << x << '\n'
    
    COUT( BOOL_WIDTH     );
    COUT( CHAR_BIT       );
    COUT( CHAR_MAX       );
    COUT( CHAR_MIN       );
    COUT( CHAR_WIDTH     );
    COUT( INT_MAX        );
    COUT( INT_MIN        );
    COUT( INT_WIDTH      );
    COUT( LLONG_MAX      );
    COUT( LLONG_MIN      );
    COUT( LLONG_WIDTH    );
    COUT( LONG_MAX       );
    COUT( LONG_MIN       );
    COUT( LONG_WIDTH     );
    COUT( MB_LEN_MAX     );
    COUT( PTRDIFF_MAX    );
    COUT( PTRDIFF_MIN    );
    COUT( SCHAR_MAX      );
    COUT( SCHAR_MIN      );
    COUT( SCHAR_WIDTH    );
    COUT( SHRT_MAX       );
    COUT( SHRT_MIN       );
    COUT( SHRT_WIDTH     );
    COUT( SIG_ATOMIC_MAX );
    COUT( SIG_ATOMIC_MIN );
    COUT( SIZE_MAX       );
    COUT( UCHAR_MAX      );
    COUT( UCHAR_WIDTH    );
    COUT( UINT_MAX       );
    COUT( UINT_WIDTH     );
    COUT( ULLONG_MAX     );
    COUT( ULLONG_WIDTH   );
    COUT( ULONG_MAX      );
    COUT( ULONG_WIDTH    );
    COUT( USHRT_MAX      );
    COUT( USHRT_WIDTH    );
    COUT( WCHAR_MAX      );
    COUT( WCHAR_MIN      );
    COUT( WINT_MAX       );
    COUT( WINT_MIN       );
}

#include <cfloat>
#include <iomanip>
#include <iostream>

int main()
{
    int w = 16;
    std::cout << std::left; // std::cout << std::setprecision(53);
#   define COUT(x) std::cout << std::setw(w) << #x << " = " << x << '\n'
    
    COUT( FLT_RADIX        );
    COUT( DECIMAL_DIG      );
    COUT( FLT_DECIMAL_DIG  );
    COUT( DBL_DECIMAL_DIG  );
    COUT( LDBL_DECIMAL_DIG );
    COUT( FLT_MIN          );
    COUT( DBL_MIN          );
    COUT( LDBL_MIN         );
    COUT( FLT_TRUE_MIN     );
    COUT( DBL_TRUE_MIN     );
    COUT( LDBL_TRUE_MIN    );
    COUT( FLT_MAX          );
    COUT( DBL_MAX          );
    COUT( LDBL_MAX         );
    COUT( FLT_EPSILON      );
    COUT( DBL_EPSILON      );
    COUT( LDBL_EPSILON     );
    COUT( FLT_DIG          );
    COUT( DBL_DIG          );
    COUT( LDBL_DIG         );
    COUT( FLT_MANT_DIG     );
    COUT( DBL_MANT_DIG     );
    COUT( LDBL_MANT_DIG    );
    COUT( FLT_MIN_EXP      );
    COUT( DBL_MIN_EXP      );
    COUT( LDBL_MIN_EXP     );
    COUT( FLT_MIN_10_EXP   );
    COUT( DBL_MIN_10_EXP   );
    COUT( LDBL_MIN_10_EXP  );
    COUT( FLT_MAX_EXP      );
    COUT( DBL_MAX_EXP      );
    COUT( LDBL_MAX_EXP     );
    COUT( FLT_MAX_10_EXP   );
    COUT( DBL_MAX_10_EXP   );
    COUT( LDBL_MAX_10_EXP  );
    COUT( FLT_ROUNDS       );
    COUT( FLT_EVAL_METHOD  );
    COUT( FLT_HAS_SUBNORM  );
    COUT( DBL_HAS_SUBNORM  );
    COUT( LDBL_HAS_SUBNORM );
}