MQL4参考 数学函数 MathSqrt
Returns the square root of a number.
double MathSqrt( double value // positive number );
Parameters
value
[in] Positive numeric value.
Return Value
Square root of value. If value is negative, MathSqrt returns NaN (indeterminate value).
Note
Instead of MathSqrt() you can use sqrt().
See also
Real types (double, float)