C++ Math log2()
The function computes the base 2 logarithm of a given number.
Suppose a number is ‘x’:
Syntax
Note: The return_type can be float, double or long double.
Parameter
x: The value whose logarithm is to be calculated.
Return value
| Parameter | Return value |
|---|---|
| x>1 | Positive |
| x=1 | Zero |
| 1>x> 0 | Negative |
| x= 0 | -infinity |
| x<0 | Not a Number(nan) |
Example 1
Let’s see the simple example when the value of x is greater than one.
Output:
Value of x is : 2 log2(x) = 1
In this example, log2() function computes the logarithm value of base 2 when the value of x is greater than one
Example 2
Let’s see the simple example when the value of x is equal to 1.
Output:
Value of x is : 1 log2(x) = 0
In this example, log2() function computes the logarithm value of base 2 when the value of x is equal to one.
Example 3
Let’s see the simple example when the value of x lies between 0 and 1.
Output:
Value of x is : 0.2 log2(x) = -2.32193
In this example, log2() function computes the logarithm value of base 2 when the value of x is equal to 0.2.
Example 4
Let’s see the simple example when the value of x is equal to zero.
Output:
Value of x is : 0 log2(x) = -inf
In this example, log2() function computes the logarithm value of base 2 when the value of x is equal to 0.
Example 5
Let’s see the simple example when the value of x is less than zero.
Output:
Value of x is : -1.5 log2(x) = nan
In this example, log2() function computes the logarithm value of base 2 when the value of x is less than zero.