log2 : log2 « math.h « C Tutorial

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C Tutorial » math.h » log2

19.45.1.log2

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

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