IT. Expert System.

C

log()

log function returns natural logarithm (base is e) of a number, where e is the exponential number.

Syntax:

double log(double);

Example:

#include 
#include 
 
int main()
{
  double n, result;
 
  printf("Enter a number to calculate it's natural log (base is e)\n");
  scanf("%lf", &n);
 
  result = log(n);
 
  printf("Natural log of %.2lf = %lf\n", n, result);
 
  return 0;
}

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