// R. Perry
// convert miles to kilometers
//
#include <stdio.h>
#include <math.h>

double mi2km( double mi)
{
  return mi*1.6093440;
}

int main( void)
{
  double mi = 10.5, km;

  km = mi2km( mi);

  printf( "%g miles = %g km\n", mi, km);

  return 0;
}

/* output:

10.5 miles = 16.8981 km

*/