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));
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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 |
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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. |
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