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Header filemath.h
Declarationint ilogbf(float num);
int ilogb(double num);
int ilogbl(long double num);
Returnreturns the exponent of num.


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

  int main(void)
  {

     int e;

     e = ilogbl(4);
 
     printf("%d", e);
 
  }

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