C math - log2() Function
The C math log2() function is used to return the base-2 (binary) logarithm of a given number.
Syntax
double log2(double x); float log2f(float x); long double log2l(long double x);
Parameters
x |
Specify the number. |
Return Value
Returns the base-2 (binary) logarithm of a given number.
If the x is negative, domain error occurs.
Example:
In the below example, log2() function is used to calculate the base-2 (binary) logarithm of a given number.
#include <stdio.h> #include <math.h> int main (){ printf("%lf\n", log2(2)); printf("%lf\n", log2(32)); printf("%lf\n", log2(50)); return 0; }
The output of the above code will be:
1.000000 5.000000 5.643856
❮ C <math.h> Library