NAG Library Manual, Mark 28.4
```    Program f07fsfe

!     F07FSF Example Program Text

!     Mark 28.4 Release. NAG Copyright 2022.

!     .. Use Statements ..
Use nag_library, Only: nag_wp, x04dbf, zpotrf, zpotrs
!     .. Implicit None Statement ..
Implicit None
!     .. Parameters ..
Integer, Parameter               :: nin = 5, nout = 6
!     .. Local Scalars ..
Integer                          :: i, ifail, info, lda, ldb, n, nrhs
Character (1)                    :: uplo
!     .. Local Arrays ..
Complex (Kind=nag_wp), Allocatable :: a(:,:), b(:,:)
Character (1)                    :: clabs(1), rlabs(1)
!     .. Executable Statements ..
Write (nout,*) 'F07FSF Example Program Results'
!     Skip heading in data file
lda = n
ldb = n
Allocate (a(lda,n),b(ldb,nrhs))

!     Read A and B from data file

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

!     Factorize A
!     The NAG name equivalent of zpotrf is f07frf
Call zpotrf(uplo,n,a,lda,info)

Write (nout,*)
Flush (nout)
If (info==0) Then

!       Compute solution
!       The NAG name equivalent of zpotrs is f07fsf
Call zpotrs(uplo,n,nrhs,a,lda,b,ldb,info)

!       Print solution

!       ifail: behaviour on error exit
!              =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft
ifail = 0
Call x04dbf('General',' ',n,nrhs,b,ldb,'Bracketed','F7.4',             &
'Solution(s)','Integer',rlabs,'Integer',clabs,80,0,ifail)

Else
Write (nout,*) 'A is not positive definite'
End If

End Program f07fsfe
```