```/* nag_sparse_complex_gen_sort (f11znc) Example Program.
*
* Copyright 2020 Numerical Algorithms Group.
*
* Mark 27.1, 2020.
*/

#include <nag.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_SparseNsym_Dups dup;
Nag_SparseNsym_Zeros zero;

INIT_FAIL(fail);

printf("nag_sparse_complex_gen_sort (f11znc) Example Program Results\n\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_SparseNsym_SumDups */
scanf("%39s%*[^\n]", nag_enum_arg);
dup = (Nag_SparseNsym_Dups)nag_enum_name_to_value(nag_enum_arg);

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

/* Output original */
printf("Original 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_complex_gen_sort (f11znc).
* Complex sparse non-Hermitian matrix reorder function.
*/
nag_sparse_complex_gen_sort(n, &nnz, a, irow, icol, dup, zero, istr, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_sparse_complex_gen_sort (f11znc)\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;
}
```