log10

#include<stdio.h>
#include<math.h>
 
main()
{
   double number, result;
 
   printf("Enter a number to calculate it's log (base is 10) ");
   scanf("%lf",&number);
 
   result = log10(number);
 
   printf("Common log of %lf = %lf", number, result);
 
   return 0;
}