C/math.h/ilogb

    
//Declaration: int ilogbf(float num); 
               int ilogb(double num); 
               int ilogbl(long double num);  
 
    
  
  #include <math.h>
  #include <stdio.h>
  int main(void)
  {
     int e;
     e = ilogbl(4);
 
     printf("%d", e);
 
  }
         
        /*2*/