C Math log2() Function
Example
Return the base 2 logarithm of different numbers:
printf("%f", log2(64.0));
printf("%f", log2(10.0));
printf("%f", log2(3.1623));
printf("%f", log2(1.0));
printf("%f", log2(0.0));
printf("%f", log2(-1.0));
Definition and Usage
The log2() function returns the base 2 logarithm of a number.
The log2() function is defined in the <math.h> header file.
Syntax
One of the following:
log2(double 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. |
Technical Details
| Returns: | A double value representing the base 2 logarithm of a
number. |
|---|