Check out example codes for "gfortran: declare an array". It will help you in understanding the concepts better.

Code Example 1

program arrayProg

   real :: numbers(5) !one dimensional real array
   integer :: matrix(3,3), i , j !two dimensional integer array
   
   !assigning some values to the array numbers
   do i=1,5
      numbers(i) = i * 2.0
   end do
   
   !display the values
   do i = 1, 5
      Print *, numbers(i)
   end do
   
   !assigning some values to the array matrix
   do i=1,3
      do j = 1, 3
         matrix(i, j) = i+j
      end do
   end do
   
   !display the values
   do i=1,3
      do j = 1, 3
         write(*,*) matrix(i,j)
      end do
   end do
   
   !short hand assignment
   numbers = (/1.5, 3.2,4.5,0.9,7.2 /)
   
   !display the values
   do i = 1, 5
      write(*,*) numbers(i)
   end do
   
end program arrayProg

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