logb: returns the exponent of num as a floating-point integer value : logb « math.h « C / ANSI-C

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

logb: returns the exponent of num as a floating-point integer value

    

//Declaration: float logbf(float num); 
               double logb(double num); 
               long double logbl(long double num);  
 

    
  

 
  #include <math.h>
  #include <stdio.h>

  int main(void)
  {
    double val = 1.0;

    do {
      printf("%f %f\n", val, logb(val));
      val++;
    } while (val<11.0);

    return 0;
  }

         
/*
1.000000 0.000000
2.000000 1.000000
3.000000 1.000000
4.000000 2.000000
5.000000 2.000000
6.000000 2.000000
7.000000 2.000000
8.000000 3.000000
9.000000 3.000000
10.000000 3.000000
*/         

           
       

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