Merge branch 'edit-poisson2d' into '2021'

Added missing variable declarations

See merge request !1

poisson2d/f90/main.f90

@@ -39,6 +39,9 @@ program poisson2d
     real(kind=8)                                :: x
     real(kind=8)                                :: y
 
+    integer                                     :: ix
+    integer                                     :: iy
+
     ! Allocate memory
     allocate(v(NX, NY), f(NX, NY))
 

poisson2d/f90/solver.f90

@@ -44,6 +44,10 @@ subroutine solver(v, f, nx, ny, eps, nmax)
     real(kind=8)                                    :: d
     real(kind=8), dimension(:,:), allocatable       :: vp
 
+    integer                                         :: ix
+    integer                                         :: iy
+    integer                                         :: ifail
+
     n = 0
     e = 2.0 * eps