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Program to find the trace of a matrix

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C     Program to find the trace of a matrix
       integer::n
       real::trace=0.0,a(10,10)
       print*,'Enter the number of row and coloumns of square matrix:'
       read(*,*)n
       write(*,*)'Enter the matrix elements:'
       do i=1,n
       read(*,*)(a(i,j),j=1,n)
       end do
       write(*,*)'The matrix is :'
       do i=1,n
       write(*,*)(a(i,j),j=1,n)
       end do
       do i=1,n
       trace=trace+a(i,i)
       end do
       write(*,*)'The trace of the entered matrix is',trace
       end
      
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