```    Program f08ucfe

!     F08UCF Example Program Text

!     Mark 27.0 Release. NAG Copyright 2019.

!     .. Use Statements ..
Use nag_library, Only: dsbgvd, nag_wp
!     .. Implicit None Statement ..
Implicit None
!     .. Parameters ..
Integer, Parameter               :: nin = 5, nout = 6
Character (1), Parameter         :: uplo = 'U'
!     .. Local Scalars ..
Integer                          :: i, info, j, ka, kb, ldab, ldbb,      &
liwork, lwork, n
!     .. Local Arrays ..
Real (Kind=nag_wp), Allocatable  :: ab(:,:), bb(:,:), w(:), work(:)
Real (Kind=nag_wp)               :: dummy(1,1)
Integer, Allocatable             :: iwork(:)
!     .. Intrinsic Procedures ..
Intrinsic                        :: max, min
!     .. Executable Statements ..
Write (nout,*) 'F08UCF Example Program Results'
Write (nout,*)
!     Skip heading in data file
Read (nin,*) n, ka, kb
ldab = ka + 1
ldbb = kb + 1
liwork = 1
lwork = 3*n
Allocate (ab(ldab,n),bb(ldbb,n),w(n),work(lwork),iwork(liwork))

!     Read the upper or lower triangular parts of the matrices A and
!     B from data file

If (uplo=='U') Then
Else If (uplo=='L') Then
End If

!     Solve the generalized symmetric band eigenvalue problem
!     A*x = lambda*B*x

!     The NAG name equivalent of dsbgvd is f08ucf
Call dsbgvd('No vectors',uplo,n,ka,kb,ab,ldab,bb,ldbb,w,dummy,1,work,    &
lwork,iwork,liwork,info)

If (info==0) Then

!       Print solution

Write (nout,*) 'Eigenvalues'
Write (nout,99999) w(1:n)
Else If (info>n .And. info<=2*n) Then
i = info - n
Write (nout,99998) 'The leading minor of order ', i,                   &
' of B is not positive definite'
Else
Write (nout,99997) 'Failure in DSBGVD. INFO =', info
End If

99999 Format (3X,(6F11.4))
99998 Format (1X,A,I4,A)
99997 Format (1X,A,I4)
End Program f08ucfe
```