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HTTP/1.1 301 Moved Permanently Server: nginx Date: Thu, 24 Jul 2025 04:52:53 GMT Content-Type: text/html; charset=UTF-8 Transfer-Encoding: chunked Connection: keep-alive Location: /reference/ios/hexfloat/ HTTP/1.1 200 OK Server: nginx Date: Thu, 24 Jul 2025 04:52:54 GMT Content-Type: text/html; charset=utf-8 Transfer-Encoding: chunked Connection: keep-alive ETag: W/"7b76-+sb6q/1UghCWVIn9SiQYrv5s6ww" Content-Encoding: gzip

TUTORIALS
REFERENCE
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C++

Tutorials
Reference
Articles
Forum

Reference

C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
- C++11
  <cfenv> (fenv.h)
- <cfloat> (float.h)
- C++11
  <cinttypes> (inttypes.h)
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
- C++11
  <cstdbool> (stdbool.h)
- <cstddef> (stddef.h)
- C++11
  <cstdint> (stdint.h)
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
- C++11
  <ctgmath> (tgmath.h)
- <ctime> (time.h)
- C++11
  <cuchar> (uchar.h)
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
- C++11
  <array>
- <deque>
- C++11
  <forward_list>
- <list>
- <map>
- <queue>
- <set>
- <stack>
- C++11
  <unordered_map>
- C++11
  <unordered_set>
- <vector>
Input/Output:
- <fstream>
- <iomanip>
- <ios>
- <iosfwd>
- <iostream>
- <istream>
- <ostream>
- <sstream>
- <streambuf>
Multi-threading:
- C++11
  <atomic>
- C++11
  <condition_variable>
- C++11
  <future>
- C++11
  <mutex>
- C++11
  <thread>
Other:
- <algorithm>
- <bitset>
- C++11
  <chrono>
- C++11
  <codecvt>
- <complex>
- <exception>
- <functional>
- C++11
  <initializer_list>
- <iterator>
- <limits>
- <locale>
- <memory>
- <new>
- <numeric>
- C++11
  <random>
- C++11
  <ratio>
- C++11
  <regex>
- <stdexcept>
- <string>
- C++11
  <system_error>
- C++11
  <tuple>
- C++11
  <type_traits>
- C++11
  <typeindex>
- <typeinfo>
- <utility>
- <valarray>

<ios>

types
- basic_ios
- fpos
- C++11
  io_errc
- ios
- ios_base
- streamoff
- streampos
- streamsize
- wios
- wstreampos
manipulators
- boolalpha
- dec
- C++11
  defaultfloat
- fixed
- hex
- C++11
  hexfloat
- internal
- left
- noboolalpha
- noshowbase
- noshowpoint
- noshowpos
- noskipws
- nounitbuf
- nouppercase
- oct
- right
- scientific
- showbase
- showpoint
- showpos
- skipws
- unitbuf
- uppercase
other functions
- C++11
  iostream_category

Reference
<ios>
hexfloat

function

std::hexfloat

ios_base& hexfloat (ios_base& str);

Use hexadecimal floating-point format

Sets the floatfield format flag for the str stream to hexfloat.

When floatfield is set to hexfloat, floating-point values are written using hexadecimal format.

The floatfield format flag is both a selective and a toggle flag: it can take any of the following values, or none:

flag value	effect when set
`fixed`	write floating-point values in fixed-point notation.
`scientific`	write floating-point values in scientific notation.
`hexfloat`	write floating-point values in hexadecimal format. The value of this is the same as `(fixed\|scientific)`
`defaultfloat`	write floating-point values in default floating-point notation. This is the value by default (same as none, before any other `floatfield` bit is set).

For standard streams, the floatfield format flag is set to defaultfloat on initialization.

Parameters

str: Stream object whose floatfield format flag is affected.
Because this function is a manipulator, it is designed to be used alone with no arguments in conjunction with the insertion (<<) and extraction (>>) operations on streams (see example below).

Return Value

Argument str.

Example

// hexfloat floatfield
#include <iostream>     // std::cout, std::hexfloat, std::defaultfloat
int main () {
  double a = 3.1415926534;
  double b = 2006.0;
  double c = 1.0e-10;
  std::cout.precision(5);
  std::cout << "hexfloat:\n" << std::hexfloat;
  std::cout << a << '\n' << b << '\n' << c << '\n';
  std::cout << '\n';
  std::cout << "defaultfloat:\n" << std::defaultfloat;
  std::cout << a << '\n' << b << '\n' << c << '\n';
  return 0;
}

Possible output:

hexfloat:
0x1.921fb5p+1
0x1.f58000p+10
0x1.b7cdfep-34
defaultfloat:
3.14159
2006
1e-010

Data races

Modifies str. Concurrent access to the same stream object may cause data races.

Exception safety

Basic guarantee: if an exception is thrown, str is in a valid state.

types

manipulators

other functions