! gfortran temperature_module.f90 10.f90
! ./a.out
program main
  use temperature_module, ONLY : celsius2farenheit, celsius2kelvin
  implicit none
  real :: c
  write (*, *) 'Insert Temperature in Celsius:   '
  read (*, *) c
  print *, celsius2farenheit(c)
  print *, celsius2kelvin(c)
end program main