```/* nag_zhptri (f07pwc) Example Program.
*
* Copyright 2017 Numerical Algorithms Group.
*
* Mark 26.1, 2017.
*/

#include <stdio.h>
#include <nag.h>
#include <nag_stdlib.h>
#include <nagf07.h>
#include <nagx04.h>

int main(void)
{
/* Scalars */
Integer ap_len, i, j, n;
Integer exit_status = 0;
NagError fail;
Nag_UploType uplo;
Nag_OrderType order;
/* Arrays */
Integer *ipiv = 0;
char nag_enum_arg[40];
Complex *ap = 0;

#ifdef NAG_COLUMN_MAJOR
#define A_UPPER(I, J) ap[J*(J-1)/2 + I - 1]
#define A_LOWER(I, J) ap[(2*n-J)*(J-1)/2 + I - 1]
order = Nag_ColMajor;
#else
#define A_LOWER(I, J) ap[I*(I-1)/2 + J - 1]
#define A_UPPER(I, J) ap[(2*n-I)*(I-1)/2 + J - 1]
order = Nag_RowMajor;
#endif

INIT_FAIL(fail);

printf("nag_zhptri (f07pwc) Example Program Results\n\n");

/* Skip heading in data file */
scanf("%*[^\n] ");
scanf("%" NAG_IFMT "%*[^\n] ", &n);
ap_len = n * (n + 1) / 2;

/* Allocate memory */
if (!(ipiv = NAG_ALLOC(n, Integer)) || !(ap = NAG_ALLOC(ap_len, Complex)))
{
printf("Allocation failure\n");
exit_status = -1;
goto END;
}
/* Read A from data file */
scanf(" %39s%*[^\n] ", nag_enum_arg);
/* nag_enum_name_to_value (x04nac).
* Converts NAG enum member name to value
*/
uplo = (Nag_UploType) nag_enum_name_to_value(nag_enum_arg);

if (uplo == Nag_Upper) {
for (i = 1; i <= n; ++i) {
for (j = i; j <= n; ++j)
scanf(" ( %lf , %lf )", &A_UPPER(i, j).re, &A_UPPER(i, j).im);
}
scanf("%*[^\n] ");
}
else {
for (i = 1; i <= n; ++i) {
for (j = 1; j <= i; ++j)
scanf(" ( %lf , %lf )", &A_LOWER(i, j).re, &A_LOWER(i, j).im);
}
scanf("%*[^\n] ");
}

/* Factorize A */
/* nag_zhptrf (f07prc).
* Bunch-Kaufman factorization of complex Hermitian
* indefinite matrix, packed storage
*/
nag_zhptrf(order, uplo, n, ap, ipiv, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_zhptrf (f07prc).\n%s\n", fail.message);
exit_status = 1;
goto END;
}
/* Compute inverse of A */
/* nag_zhptri (f07pwc).
* Inverse of complex Hermitian indefinite matrix, matrix
* already factorized by nag_zhptrf (f07prc), packed storage
*/
nag_zhptri(order, uplo, n, ap, ipiv, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_zhptri (f07pwc).\n%s\n", fail.message);
exit_status = 1;
goto END;
}
/* Print inverse */
/* nag_pack_complx_mat_print_comp (x04ddc).
* Print complex packed triangular matrix (comprehensive)
*/
fflush(stdout);
nag_pack_complx_mat_print_comp(order, uplo, Nag_NonUnitDiag, n, ap,
Nag_BracketForm, "%7.4f", "Inverse",
Nag_IntegerLabels, 0, Nag_IntegerLabels, 0,
80, 0, 0, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_pack_complx_mat_print_comp (x04ddc).\n%s\n",
fail.message);
exit_status = 1;
goto END;
}
END:
NAG_FREE(ipiv);
NAG_FREE(ap);

return exit_status;
}
```