完完全全的从jdk-doc上copy下来的，怎么会没有？要学会看文档static double sqrt(double a)
Returns the correctly rounded positive square root of a double value.
sqrt
public static double sqrt(double a)Returns the correctly rounded positive square root of a double value. Special cases:
If the argument is NaN or less than zero, then the result is NaN.
If the argument is positive infinity, then the result is positive infinity.
If the argument is positive zero or negative zero, then the result is the same as the argument.
Otherwise, the result is the double value closest to the true mathetmatical square root of the argument value.
Parameters:
a - a double value.
Returns:
the positive square root of a. If the argument is NaN or less than zero, the result is NaN.
Returns the correctly rounded positive square root of a double value.
sqrt
public static double sqrt(double a)Returns the correctly rounded positive square root of a double value. Special cases:
If the argument is NaN or less than zero, then the result is NaN.
If the argument is positive infinity, then the result is positive infinity.
If the argument is positive zero or negative zero, then the result is the same as the argument.
Otherwise, the result is the double value closest to the true mathetmatical square root of the argument value.
Parameters:
a - a double value.
Returns:
the positive square root of a. If the argument is NaN or less than zero, the result is NaN.
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第一个参数是被开方的数
第二个参数是开方的幂Math.sqrt(a)
相当于
Math.sqrt(a,2)
Math.sqrt(a)
相当于
Math.pow(a,2)