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To solve Poison equation in 2D

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PROGRAM Poisson_equation_in_2D
parameter (kx=40,ky=40)
integer::i,j,k
real::rho(kx,ky),V(kx,ky),R(kx,ky),d
open(1,file='poisson input',status='unknown')
open(2,file='poisson output',status='unknown')
read(1,*)((rho(i,j),j=1,ky),i=1,kx)
k=0
d=0.025
do i=1,kx
do j=1,ky
V(i,j)=0.0
enddo
enddo
4 do i=2,kx-1
do j=2,ky-1
R(i,j)=V(i+1,j)+V(i-1,j)+V(i,j+1)+V(i,j-1)-4*V(i,j)+rho(i,j)*d**2
enddo
enddo
do i=2,kx-1
do j=2,ky-1
if(abs(R(i,j))>0.0000001)goto 3
enddo
enddo
goto 5
3 k=k+1
do i=2,kx-1
do j=2,ky-1
V(i,j)=V(i,j)+0.25*R(i,j)
enddo
enddo
goto 4
5 write(*,6)k
do i=1,kx+1
do j=1,ky+1
write(2,7)i,j,V(i,j)
enddo
enddo
6 format('no of Iteration=',i5)
7 format(i2,1x,i2,1x,f7.5)
end

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