Difference between revisions of "cpp/numeric/fenv/feclearexcept"
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| − | {{ | + | {{dcl begin}} |
| − | {{ | + | {{dcl header | cfenv}} |
| − | {{ | + | {{dcl | since=c++11 | |
| − | int feclearexcept(int excepts); | + | int feclearexcept( int excepts ); |
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| − | {{ | + | {{dcl end}} |
Attempts to clear the floating-point exceptions that are listed in the bitmask argument {{tt|excepts}}, which is a bitwise OR of the [[cpp/numeric/fenv/FE_exceptions|floating point exception macros]]. | Attempts to clear the floating-point exceptions that are listed in the bitmask argument {{tt|excepts}}, which is a bitwise OR of the [[cpp/numeric/fenv/FE_exceptions|floating point exception macros]]. | ||
===Parameters=== | ===Parameters=== | ||
| − | {{ | + | {{par begin}} |
| − | {{ | + | {{par | excepts | bitmask listing the exception flags to clear}} |
| − | {{ | + | {{par end}} |
===Return value=== | ===Return value=== | ||
{{c|0}} if all indicated exceptions were successfully cleared or if {{tt|excepts}} is zero. Returns a non-zero value on error. | {{c|0}} if all indicated exceptions were successfully cleared or if {{tt|excepts}} is zero. Returns a non-zero value on error. | ||
| − | {{cpp/numeric/fenv/example1}} | + | ===Example=== |
| + | {{include| cpp/numeric/fenv/example1}} | ||
===See also=== | ===See also=== | ||
| − | {{ | + | {{dsc begin}} |
| − | {{ | + | {{dsc inc | cpp/numeric/fenv/dsc fetestexcept}} |
| − | {{ | + | {{dsc see c | c/numeric/fenv/feclearexcept}} |
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Latest revision as of 06:50, 18 September 2017
| Defined in header <cfenv>
|
||
| int feclearexcept( int excepts ); |
(since C++11) | |
Attempts to clear the floating-point exceptions that are listed in the bitmask argument excepts, which is a bitwise OR of the floating point exception macros.
Contents |
[edit] Parameters
| excepts | - | bitmask listing the exception flags to clear |
[edit] Return value
0 if all indicated exceptions were successfully cleared or if excepts is zero. Returns a non-zero value on error.
[edit] Example
Run this code
#include <cfenv> #include <cmath> #include <iostream> // #pragma STDC FENV_ACCESS ON volatile double zero = 0.0; // volatile not needed where FENV_ACCESS is supported volatile double one = 1.0; // volatile not needed where FENV_ACCESS is supported int main() { std::feclearexcept(FE_ALL_EXCEPT); std::cout << "1.0/0.0 = " << 1.0 / zero << '\n'; if (std::fetestexcept(FE_DIVBYZERO)) std::cout << "division by zero reported\n"; else std::cout << "division by zero not reported\n"; std::feclearexcept(FE_ALL_EXCEPT); std::cout << "1.0/10 = " << one / 10 << '\n'; if (std::fetestexcept(FE_INEXACT)) std::cout << "inexact result reported\n"; else std::cout << "inexact result not reported\n"; std::feclearexcept(FE_ALL_EXCEPT); std::cout << "sqrt(-1) = " << std::sqrt(-1) << '\n'; if (std::fetestexcept(FE_INVALID)) std::cout << "invalid result reported\n"; else std::cout << "invalid result not reported\n"; }
Possible output:
1.0/0.0 = inf division by zero reported 1.0/10 = 0.1 inexact result reported sqrt(-1) = -nan invalid result reported
[edit] See also
| (C++11) |
determines which of the specified floating-point status flags are set (function) |
| C documentation for feclearexcept
| |
