The log1p() method of Math class returns the natural logarithmic sum for the specified double argument and 1. Its value is much closer to result of ln(1 + x).

Syntax:

public static double log1p (double a)

Parameters:

The parameter ‘a’ represents a double value.

Return Value:

The log1p() method returns the natural log of x +1.

Special cases of the log1p() method are as follows:

  • It returns NaN, if the argument is NaN or less than -1.
  • It returns positive infinity, if the argument passed is positive infinite.
  • It returns negative infinity, if the argument passed is negative one.
  • It returns zero with the same sign as the argument, if the argument passed is equal to zero.

Example 1:

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Example 2:

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Example 3:

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Example 5:

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Example 6:

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