C Tutorial/math.h/logb

logb

Item Value Header file math.h Declaration float logbf(float num);double logb(double num);long double logbl(long double num); Return returns the exponent of num as a floating-point integer value.

<source lang="cpp">#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;
 }</source>