MathClassify
MathClassify
Determines the type of a real number and returns a result as a value from the ENUM_FP_CLASS enumeration
ENUM_FP_CLASS MathClassify(
double value // real number
);Parameters
- value
[in] The real number to be checked
Return Value
A value from the ENUM_FP_CLASS enumeration
ENUM_FP_CLASS
| ID | Description |
|---|---|
| FP_SUBNORMAL | A subnormal number which is closer to zero than the smallest representable normal number DBL_MIN (2.2250738585072014e-308) |
| FP_NORMAL | A normal number in the range between 2.2250738585072014e-308 and 1.7976931348623158e+308 |
| FP_ZERO | A positive or a negative zero |
| FP_INFINITE | A number which cannot be represented by the appropriate type, positive or negative infinity |
| FP_NAN | Not a number. |
Example:
//+------------------------------------------------------------------+
//| Script program start function |
//+------------------------------------------------------------------+
void OnStart()
{
//--- test NaN
double nan=double("nan");
PrintFormat("Test NaN: %G is %s, MathIsValidNumber(NaN)=%s",
nan,
EnumToString(MathClassify(nan)),
(string)MathIsValidNumber(nan));
//--- test infinity
double inf=double("inf");
PrintFormat("Test Inf: %G is %s, MathIsValidNumber(inf)=%s",
inf,
EnumToString(MathClassify(inf)),
(string)MathIsValidNumber(inf));
//--- test normal value
double normal=1.2345e6;
PrintFormat("Test Normal: %G is %s, MathIsValidNumber(normal)=%s",
normal,
EnumToString(MathClassify(normal)),
(string)MathIsValidNumber(normal));
//--- test subnormal value
double sub_normal=DBL_MIN/2.0;
PrintFormat("Test Subnormal: %G is %s, MathIsValidNumber(sub_normal)=%s",
sub_normal,
EnumToString(MathClassify(sub_normal)),
(string)MathIsValidNumber(sub_normal));
//--- test zero value
double zero=0.0/(-1);
PrintFormat("Test Zero: %G is %s, MathIsValidNumber(zero)=%s",
zero,
EnumToString(MathClassify(zero)),
(string)MathIsValidNumber(zero));
}
/*
Result:
Test NaN: NAN is FP_NAN, MathIsValidNumber(NaN)=false
Test Inf: INF is FP_INFINITE, MathIsValidNumber(inf)=false
Test Normal: 1.2345E+06 is FP_NORMAL, MathIsValidNumber(normal)=true
Test Subnormal: 1.11254E-308 is FP_SUBNORMAL, MathIsValidNumber(sub_normal)=true
Test Zero: -0 is FP_ZERO, MathIsValidNumber(zero)=true
*/
//+------------------------------------------------------------------+
See also
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