```/* nag_sparse_herm_sort (f11zpc) Example Program.
*
* Copyright 2017 Numerical Algorithms Group.
*
* Mark 26.2, 2017.
*/

#include <nag.h>
#include <nag_stdlib.h>
#include <nagf11.h>

int main(void)
{
/* Scalars */
Integer exit_status = 0;
Integer i, n, nnz;
/* Arrays */
char nag_enum_arg[40];
Integer *irow = 0, *icol = 0, *istr = 0;
Complex *a = 0;
/* NAG types */
NagError fail;
Nag_SparseSym_Dups dup;
Nag_SparseSym_Zeros zero;

INIT_FAIL(fail);

printf("nag_sparse_herm_sort (f11zpc) Example Program Results\n");

/* Skip heading in data file */
scanf("%*[^\n]");

/* Read order of matrix and number of nonzero entries */
scanf("%" NAG_IFMT "%*[^\n]", &n);
scanf("%" NAG_IFMT "%*[^\n]", &nnz);

/* Allocate memory */
if (!(a = NAG_ALLOC(nnz, Complex)) ||
!(icol = NAG_ALLOC(nnz, Integer)) ||
!(irow = NAG_ALLOC(nnz, Integer)) ||
!(istr = NAG_ALLOC((n + 1), Integer)))
{
printf("Allocation failure\n");
exit_status = -1;
goto END;
}

/* Read and output the original nonzero elements */
for (i = 0; i < nnz; i++)
scanf(" ( %lf , %lf ) %" NAG_IFMT "%" NAG_IFMT "%*[^\n]", &a[i].re,
&a[i].im, &irow[i], &icol[i]);

/* Reorder, sum duplicates and remove zeros */
/* Nag_SparseSym_SumDups */
scanf("%39s %*[^\n]", nag_enum_arg);
dup = (Nag_SparseSym_Dups) nag_enum_name_to_value(nag_enum_arg);

/* Nag_SparseSym_RemoveZeros */
scanf("%39s %*[^\n]", nag_enum_arg);
zero = (Nag_SparseSym_Zeros) nag_enum_name_to_value(nag_enum_arg);

/* Output original */
printf("\nOriginal elements\n");
printf("%s%4" NAG_IFMT "\n", " n   =", n);
printf("%s%4" NAG_IFMT "\n", " nnz =", nnz);

printf("%9s%14s%22s%9s\n", "i", "a", "irow", "icol");
for (i = 0; i < nnz; i++)
printf("%9" NAG_IFMT " (%13.4e, %13.4e)%9" NAG_IFMT "%9" NAG_IFMT "\n",
i, a[i].re, a[i].im, irow[i], icol[i]);

/* nag_sparse_herm_sort (f11zpc).
* Complex sparse Hermitian matrix reorder function.
*/
nag_sparse_herm_sort(n, &nnz, a, irow, icol, dup, zero, istr, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_sparse_herm_sort (f11zpc)\n%s\n", fail.message);
exit_status = 1;
goto END;
}

/* Output results */
printf("\nReordered elements\n");
printf("%s%4" NAG_IFMT "\n", " nnz =", nnz);

printf("%9s%14s%22s%9s\n", "i", "a", "irow", "icol");
for (i = 0; i < nnz; i++)
printf("%9" NAG_IFMT " (%13.4e, %13.4e)%9" NAG_IFMT "%9" NAG_IFMT "\n",
i, a[i].re, a[i].im, irow[i], icol[i]);

END:
NAG_FREE(a);
NAG_FREE(icol);
NAG_FREE(irow);
NAG_FREE(istr);

return exit_status;
}
```