Even Odd in Fortran

Welcome to the Even Odd in Fortran page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

program evenodd
   implicit none
   character(len=12) :: arg
   character(len=52) :: letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
   integer :: number, ios, argc

   argc = command_argument_count()
   if (argc /= 1) call usage()

   call get_command_argument(1, arg)
   if (len_trim(arg) == 0) call usage()
   if (scan(arg, letters) > 0) call usage()

   read(arg, *, iostat=ios) number
   if (ios /= 0) call usage()

   if (mod(number,2) == 0) then
      write(*,*) "Even"
   else
      write(*,*) "Odd"
   end if

contains

   subroutine usage()
      write(*,*) "Usage: please input a number"
      stop
   end subroutine

end program evenodd

Even Odd in Fortran was written by:

• Mallikarjuna S J
• Ștefan-Iulian Alecu

If you see anything you'd like to change or update, please consider contributing.

How to Implement the Solution

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How to Run the Solution

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