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Sets the floatfield format flag for the str stream to fixed.
When floatfield is set to fixed, floating-point values are written using fixed-point notation: the value is represented with exactly as many digits in the decimal part as specified by the precision field (precision) and with no exponent part.
The precision field can be modified using member precision.
Notice that the treatment of the precision field differs between the default floating-point notation and the fixed and scientific notations (see precision). On the default floating-point notation, the precision field specifies the maximum number of meaningful digits to display both before and after the decimal point, while in both the fixed and scientific notations, the precision field specifies exactly how many digits to display after the decimal point, even if they are trailing decimal zeros.
Possible output:
Reference
C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
-
<cfenv> (fenv.h)C++11
- <cfloat> (float.h)
-
<cinttypes> (inttypes.h)C++11
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
-
<cstdbool> (stdbool.h)C++11
- <cstddef> (stddef.h)
-
<cstdint> (stdint.h)C++11
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
-
<ctgmath> (tgmath.h)C++11
- <ctime> (time.h)
-
<cuchar> (uchar.h)C++11
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
-
<array>C++11
- <deque>
-
<forward_list>C++11
- <list>
- <map>
- <queue>
- <set>
- <stack>
-
<unordered_map>C++11
-
<unordered_set>C++11
- <vector>
-
Input/Output:
Multi-threading:
-
<atomic>C++11
-
<condition_variable>C++11
-
<future>C++11
-
<mutex>C++11
-
<thread>C++11
-
Other:
- <algorithm>
- <bitset>
-
<chrono>C++11
-
<codecvt>C++11
- <complex>
- <exception>
- <functional>
-
<initializer_list>C++11
- <iterator>
- <limits>
- <locale>
- <memory>
- <new>
- <numeric>
-
<random>C++11
-
<ratio>C++11
-
<regex>C++11
- <stdexcept>
- <string>
-
<system_error>C++11
-
<tuple>C++11
-
<type_traits>C++11
-
<typeindex>C++11
- <typeinfo>
- <utility>
- <valarray>
<ios>
types
manipulators
other functions
-
iostream_categoryC++11
-
function
<ios> <iostream>
std::fixed
ios_base& fixed (ios_base& str);
Use fixed floating-point notation
When floatfield is set to fixed, floating-point values are written using fixed-point notation: the value is represented with exactly as many digits in the decimal part as specified by the precision field (precision) and with no exponent part.
The floatfield format flag is both a selective and a toggle flag: it can take one, both or none of the following values:
The default notation (none) is a different floatfield value than either fixed or scientific. The default notation can be selected by calling
For standard streams, no floatfield is set on initialization (default notation).
| flag value | effect when set |
|---|---|
| fixed | write floating-point values in fixed-point notation |
| scientific | write floating-point values in scientific notation. |
| (none) | write floating-point values in default floating-point notation. |
str.unsetf(ios_base::floatfield).For standard streams, no floatfield is set on initialization (default notation).
The floatfield format flag is both a selective and a toggle flag: it can take any of the following values, or none:
For standard streams, the floatfield format flag is set to defaultfloat on initialization.
| 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.
The precision field can be modified using member precision.
Notice that the treatment of the precision field differs between the default floating-point notation and the fixed and scientific notations (see precision). On the default floating-point notation, the precision field specifies the maximum number of meaningful digits to display both before and after the decimal point, while in both the fixed and scientific notations, the precision field specifies exactly how many digits to display after the decimal point, even if they are trailing decimal zeros.
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
|
|
Possible output:
default: 3.1416 2006 1e-010 fixed: 3.14159 2006.00000 0.00000 scientific: 3.14159e+000 2.00600e+003 1.00000e-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.See also
- scientific
- Use scientific floating-point notation (function)
- ios_base::flags
- Get/set format flags (public member function)
- ios_base::setf
- Set specific format flags (public member function)
- ios_base::unsetf
- Clear specific format flags (public member function)
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Spotted an error? contact us