log code

1)
/*  log problem   */
#include <stdio.h>
#include <math.h>
int main (void)
{
  /*  declare variable  */
  double positive_integers, result;
  printf("Enter positive_integers: \n");
  scanf("%lf", &positive_integers);
  /*  calculations to find result of base2  */
  result = log(positive_integers)/log(2);
  printf("THe result of logarithm of base 2 for %5.5f is %5.5f\n",positive_integers,result);
  return 0;
}

2)
/*  log problem   */
#include <stdio.h>
#include <math.h>
int main (void)
{
  /*  declare variable  */
  double positive_integers, result;
  printf("Enter positive_integers: \n");
  scanf("%lf", &positive_integers);
  /*  calculations to find result of base8  */
  result = log(positive_integers)/log(8);
  printf("THe result of logarithm of base 2 for %5.5f is %5.5f\n",positive_integers,result);
  return 0;
}