Item | Value |
Header file | math.h |
Declaration | float log2f(float num); double log2(double num); long double log2l(long double num); |
Return | returns the base 2 logarithm for num. |
#include <math.h> #include <stdio.h> int main(void) { double val = 1.0; do { printf("%f %f\n", val, log2(val)); val++; } while (val<11.0); return 0; }
1.000000 0.000000 2.000000 1.000000 3.000000 1.584963 4.000000 2.000000 5.000000 2.321928 6.000000 2.584963 7.000000 2.807355 8.000000 3.000000 9.000000 3.169925 10.000000 3.321928
19.45.log2 | ||||
19.45.1. | log2 |