log2: returns the base 2 logarithm for num : log2 « math.h « C / ANSI-C

1. C / ANSI-C
2. math.h
3. log2

log2: returns the base 2 logarithm for num

    
//Declaration: float log2f(float num); 
               double log2(double num); 
               long double log2l(long double 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
*/         

           
       

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