java中的exp是什么??怎么用??

java中的exp是什么??怎么用??

exp
public static double exp(double a)Returns Euler's number e raised to the power of a double value. Special cases:
If the argument is NaN, the result is NaN.
If the argument is positive infinity, then the result is positive infinity.
If the argument is negative infinity, then the result is positive zero.
The computed result must be within 1 ulp of the exact result. Results must be semi-monotonic.

Parameters:
a - the exponent to raise e to.
Returns:
the value ea, where e is the base of the natural logarithms.

是计算e的幂的。 e你知道吗？是一个数学常数，2.7 多少的。 math.exp(2.0)就是计算e的2次方。 类型是double型的。