logb : logb « math.h « C Tutorial

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C Tutorial » math.h » logb

19.48.1.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.

#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

19.48.logb
	19.48.1.	logb

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