iframe-proxy | Sunbelt Computer Software

History

73 lines (58 loc) · 2.88 KB

Raw

// Distributed under the Boost Software License, Version 1.0.

// https://www.boost.org/LICENSE_1_0.txt

// This example demonstrates usage and formatting of decimal types with <format>

#include <boost/decimal/decimal32_t.hpp> // For type decimal32_t

#include <boost/decimal/decimal64_t.hpp> // For type decimal64_t

#include <boost/decimal/format.hpp> // For <format> support (when available)

#include <iostream>

// This macro is defined in boost/decimal/format.hpp if the platform has <format> support

#ifdef BOOST_DECIMAL_HAS_FORMAT_SUPPORT

#include <format>

int main()

{

constexpr boost::decimal::decimal64_t val1 {"3.14"};

constexpr boost::decimal::decimal32_t val2 {"3.141"};

// The easiest is no specification which is general format

// Given these values they will print in fixed format

std::cout << "Default Format:\n";

std::cout << std::format("{}", val1) << '\n';

std::cout << std::format("{}", val2) << "\n\n";

// Next we can add a type modifier to get scientific formatting

std::cout << "Scientific Format:\n";

std::cout << std::format("{:e}", val1) << '\n';

std::cout << std::format("{:e}", val2) << "\n\n";

// Next we can add a type modifier to get scientific formatting

// Here this gives one digit of precision rounded according to current rounding mode

std::cout << "Scientific Format with Specified Precision:\n";

std::cout << std::format("{:.1e}", val1) << '\n';

std::cout << std::format("{:.1e}", val2) << "\n\n";

// Width specifies the minimum field width

// By default, values are right-aligned with space fill

std::cout << "Width with Default Alignment (right-align, space fill):\n";

std::cout << std::format("[{:12}]", val1) << '\n';

std::cout << std::format("[{:12.3e}]", val2) << "\n\n";

// Alignment specifiers: < (left), > (right), ^ (center)

std::cout << "Alignment Specifiers:\n";

std::cout << std::format("[{:<12}]", val1) << " (left)\n";

std::cout << std::format("[{:>12}]", val1) << " (right)\n";

std::cout << std::format("[{:^12}]", val1) << " (center)\n\n";

// Fill character can be any character placed before the alignment specifier

std::cout << "Custom Fill Characters:\n";

std::cout << std::format("[{:*<12}]", val1) << " (left, * fill)\n";

std::cout << std::format("[{:->12}]", val1) << " (right, - fill)\n";

std::cout << std::format("[{:=^12}]", val1) << " (center, = fill)\n\n";

// Combining fill, alignment, sign, width, precision, and type

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

std::cout << std::format("[{:*>+12.2e}]", val1) << " (right, * fill, + sign, precision 2, scientific)\n";

std::cout << std::format("[{:-<+12.2f}]", val2) << " (left, - fill, + sign, precision 2, fixed)\n";

return 0;

}

#else

int main()

{

std::cout << "<format> is unsupported" << std::endl;

return 0;

}

#endif

Sunbelt Computer Software

PL/B Language Development and Support

Navigation Menu

Uh oh!

Sunbelt Computer Software

PL/B Language Development and Support

Uh oh!

FilesExpand file tree

format.cpp

Latest commit

History

format.cpp

File metadata and controls