log1p : log1p « math.h « C Tutorial

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C Tutorial » math.h » log1p

19.44.1.log1p

Item	Value
Header file	math.h
Declaration	float log1pf(float num); double log1p(double num); long double log1pl(long double num);
Return	returns the natural logarithm for num+1.

#include <math.h>

  #include <stdio.h>



  int main(void)

  {

    double val = 1.0;



    do {

      printf("%f %f\n", val, log1p (val));

      val++;

    } while (val<11.0);



    return 0;

  }

1.000000 0.693147
2.000000 1.098612
3.000000 1.386294
4.000000 1.609438
5.000000 1.791759
6.000000 1.945910
7.000000 2.079442
8.000000 2.197225
9.000000 2.302585
10.000000 2.397895

19.44.log1p
	19.44.1.	log1p

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