{

using boost::int128::int128;

using boost::int128::uint128;

std::cout << "=== Basic Formatting ===" << std::endl;

constexpr uint128 unsigned_value {0xDEADBEEF, 0xCAFEBABE12345678};

constexpr int128 signed_value {-123456789012345678};

// Default decimal formatting

std::cout << fmt::format("Default (decimal): {}", unsigned_value) << std::endl;

std::cout << fmt::format("Signed value: {}", signed_value) << std::endl;

std::cout << "\n=== Base Specifiers ===" << std::endl;

// Different bases: binary, octal, decimal, hex

constexpr uint128 value {255};

std::cout << fmt::format("Binary: {:b}", value) << std::endl;

std::cout << fmt::format("Octal: {:o}", value) << std::endl;

std::cout << fmt::format("Decimal: {:d}", value) << std::endl;

std::cout << fmt::format("Hexadecimal: {:x}", value) << std::endl;

std::cout << fmt::format("Hex (upper): {:X}", value) << std::endl;

std::cout << "\n=== Alternate Form (Prefixes) ===" << std::endl;

// Using # for alternate form adds base prefixes

std::cout << fmt::format("Binary with prefix: {:#b}", value) << std::endl;

std::cout << fmt::format("Octal with prefix: {:#o}", value) << std::endl;

std::cout << fmt::format("Hex with prefix: {:#x}", value) << std::endl;

std::cout << fmt::format("Hex upper prefix: {:#X}", value) << std::endl;

std::cout << "\n=== Sign Options ===" << std::endl;

constexpr int128 positive {42};

constexpr int128 negative {-42};

// Sign specifiers: + (always show), - (default), space (space for positive)

std::cout << fmt::format("Plus sign: {:+} and {:+}", positive, negative) << std::endl;

std::cout << fmt::format("Minus only: {} and {}", positive, negative) << std::endl;

std::cout << fmt::format("Space sign: {: } and {: }", positive, negative) << std::endl;

std::cout << "\n=== Zero Padding ===" << std::endl;

// Padding with zeros (no alignment specifier)

std::cout << fmt::format("8-digit padding: {:08}", value) << std::endl;

std::cout << fmt::format("16-digit padding: {:016}", value) << std::endl;

std::cout << "\n=== Alignment ===" << std::endl;

// Left, right, and center alignment with default fill (space)

std::cout << fmt::format("Left align: '{:<10}'", positive) << std::endl;

std::cout << fmt::format("Right align: '{:>10}'", positive) << std::endl;

std::cout << fmt::format("Center align: '{:^10}'", positive) << std::endl;

std::cout << "\n=== Alignment with Fill Characters ===" << std::endl;

// Custom fill characters

std::cout << fmt::format("Left with *: '{:*<10}'", positive) << std::endl;

std::cout << fmt::format("Right with 0: '{:0>10}'", positive) << std::endl;

std::cout << fmt::format("Center with -: '{:-^10}'", positive) << std::endl;

std::cout << "\n=== Alignment with Sign ===" << std::endl;

// Alignment combined with sign specifiers

std::cout << fmt::format("Right align +: '{:>+10}'", positive) << std::endl;

std::cout << fmt::format("Left align +: '{:<+10}'", positive) << std::endl;

std::cout << fmt::format("Center align +: '{:^+11}'", positive) << std::endl;

std::cout << fmt::format("Right align -: '{:*>10}'", negative) << std::endl;

std::cout << "\n=== Alignment with Hex and Prefix ===" << std::endl;

// Alignment with base specifiers and prefixes

std::cout << fmt::format("Right align hex: '{:>10x}'", value) << std::endl;

std::cout << fmt::format("Left align hex: '{:<10x}'", value) << std::endl;

std::cout << fmt::format("Center with prefix: '{:*^#12x}'", value) << std::endl;

std::cout << "\n=== Large Values ===" << std::endl;

// Demonstrate with values beyond 64-bit range

constexpr auto uint_max {std::numeric_limits<uint128>::max()};

constexpr auto int_min {std::numeric_limits<int128>::min()};

std::cout << fmt::format("uint128 max: {}", uint_max) << std::endl;

std::cout << fmt::format("uint128 max (hex): {:#x}", uint_max) << std::endl;

std::cout << fmt::format("int128 min: {}", int_min) << std::endl;

std::cout << "\n=== Combined Format Specifiers ===" << std::endl;

// Combining multiple specifiers

std::cout << fmt::format("Hex with prefix, uppercase, padded: {:#016X}", unsigned_value) << std::endl;

std::cout << fmt::format("Signed with plus, padded: {:+020}", signed_value) << std::endl;

return 0;

{

std::cout << "This example requires {fmt} library to be installed." << std::endl;

std::cout << "Install from: https://github.com/fmtlib/fmt" << std::endl;

return 0;