The function
log2() of
cmath header file in
C++ is used to find the logarithmic value with
base 2 of the passed argument.
Syntax:
log2(x)
Parameters: This function takes a value
x, in the range
[0, ∞] whose log value is to be found.
Return Type: It returns the logarithmic value, as double, float or long double type, based on the following conditions:
- If x > 1: It returns the positive logarithmic value of x.
- If x is equals to 1: It returns 0.
- If 0 < x < 1: It returns the negative logarithmic value of x.
- If x is equals to 0: It returns the negative infinity(-∞).
- If x < 0: It returns NaN(Not a Number).
Below examples demonstrate the use of log2() method:
Example 1:
Output:
4
1.32193
3.37156
4.67243
Example 2:
