log : log « math.h « C Tutorial

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C Tutorial » math.h » log

19.47.1.log

Item	Value
Header file	math.h
Declaration	float logf(float num); double log(double num); long double logl(long double num);
Return	returns the natural logarithm for num.

#include <math.h>

  #include <stdio.h>



  int main(void)

  {

    double val = 1.0;



    do {

      printf("%f %f\n", val, log(val));

      val++;

    } while (val<11.0);



    return 0;

  }

1.000000 0.000000
2.000000 0.693147
3.000000 1.098612
4.000000 1.386294
5.000000 1.609438
6.000000 1.791759
7.000000 1.945910
8.000000 2.079442
9.000000 2.197225
10.000000 2.302585

19.47.log
	19.47.1.	log

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