log10

log10 function returns common logarithm (base is 10) of a number.
Declaration :- double log10(double number);

C programming code for log10

#include <stdio.h>
#include <math.h>
 
int main()
{
  double n, result;
 
  printf("Enter a number to calculate it's log(base is 10)\n");
  scanf("%lf", &n);
 
  result = log10(n);
 
  printf("Common log of %.2lf = %.2lf\n", n, result);
 
  return 0;
}

Compiler used: 

GCC

Output of program: