log()

The log function returns the logarithm of x to the base of e.

Sample Program:

/*

Write a program to illustrate log math function of C.
*/

#include<stdio.h>

#include<math.h>

main(){

 double number, result;
 printf("Enter a number(base is e)   ");
 scanf("%lf",&number);
 result = log(number);
 printf("Natural log of %lf = %lf", number, result);
 return 0;
}

Output:

Enter a number(base is e) 10

Natural log of 10.000000 = 2.302585