Math h C Tutorial

Item Value
Header filemath.h
Declarationfloat log2f(float num);double log2(double num);long double log2l(long double num);
Returnreturns the base 2 logarithm for num.

#include 
  #include 
  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