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