new files

Task/Bulls-and-cows/Fortran/bulls-and-cows.f

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+module bac
+  implicit none
+
+contains
+
+  subroutine Gennum(n)
+    integer, intent(out) :: n(4)
+    integer :: i, j
+    real :: r
+
+    call random_number(r)
+    n(1) = int(r * 9.0) + 1
+    i = 2
+
+outer: do while (i <= 4)
+         call random_number(r)
+         n(i) = int(r * 9.0) + 1
+inner:   do j = i-1 , 1, -1
+           if (n(j) == n(i)) cycle outer
+         end do inner
+         i = i + 1
+       end do outer
+
+  end subroutine Gennum
+
+  subroutine Score(n, guess, b, c)
+    character(*), intent(in) :: guess
+    integer, intent(in) :: n(0:3)
+    integer, intent(out) :: b, c
+    integer :: digit, i, j, ind
+
+    b = 0; c = 0
+    do i = 1, 4
+      read(guess(i:i), "(i1)") digit
+      if (digit == n(i-1)) then
+        b = b + 1
+      else
+        do j = i, i+2
+          ind = mod(j, 4)
+          if (digit == n(ind)) then
+            c = c + 1
+            exit
+          end if
+        end do
+      end if
+    end do
+
+ end subroutine Score
+
+end module bac
+
+program Bulls_and_Cows
+   use bac
+   implicit none
+
+   integer :: n(4)
+   integer :: bulls=0, cows=0, tries=0
+   character(4) :: guess
+
+   call random_seed
+   call Gennum(n)
+
+   write(*,*) "I have selected a number made up of 4 digits (1-9) without repetitions."
+   write(*,*) "You attempt to guess this number."
+   write(*,*) "Every digit in your guess that is in the correct position scores 1 Bull"
+   write(*,*) "Every digit in your guess that is in an incorrect position scores 1 Cow"
+   write(*,*)
+
+   do while (bulls /= 4)
+     write(*,*) "Enter a 4 digit number"
+     read*, guess
+     if (verify(guess, "123456789") /= 0) then
+       write(*,*) "That is an invalid entry. Please try again."
+       cycle
+     end if
+     tries = tries + 1
+     call Score (n, guess, bulls, cows)
+     write(*, "(a, i1, a, i1, a)") "You scored ", bulls, " bulls and ", cows, " cows"
+     write(*,*)
+   end do
+
+   write(*,"(a,i0,a)") "Congratulations! You correctly guessed the correct number in ", tries, " attempts"
+
+end program Bulls_and_Cows