C++ cmath log2() function
Example
Return the base 2 logarithm of different numbers:
cout << log2(64.0);
cout << log2(10.0f);
cout << log2(3.1623);
cout << log2(1.0);
cout << log2(0.0f);
cout << log2(-1.0f);
Definition and Usage
The log2() function returns the base 2 logarithm of a number.
The log2() function is defined in the <cmath> header file.
Syntax
One of the following:
log2(double number);log2(float number);Parameter Values
| Parameter | Description |
|---|---|
| number |
Required. Specifies the value to calculate the logarithm for. If the value is negative, it returns NaN (Not a Number). If the value is 0, it returns -infinity. If this is an integer type then it will be treated as a double.
|
Technical Details
| Returns: | A float value (if the argument is float) or double value (in any other case) representing the base 2 logarithm of a number. |
|---|
