```/* nag_zhpr (f16sqc) Example Program.
*
* Copyright 2017 Numerical Algorithms Group.
*
* Mark 26.2, 2017.
*/

#include <stdio.h>
#include <nag.h>
#include <nag_stdlib.h>
#include <nagf16.h>
#include <nagx04.h>

int main(void)
{

/* Scalars */
double alpha, beta;
Integer exit_status, i, incx, j, n, ap_len, xlen;

/* Arrays */
Complex *ap = 0, *x = 0;
char nag_enum_arg[40];

/* Nag Types */
NagError fail;
Nag_OrderType order;
Nag_UploType uplo;

#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

exit_status = 0;
INIT_FAIL(fail);

printf("nag_zhpr (f16sqc) Example Program Results\n\n");

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

/* Read the problem dimension */
scanf("%" NAG_IFMT "%*[^\n] ", &n);

/* Read the uplo storage parameter */
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);

scanf("%lf%lf%*[^\n] ", &alpha, &beta);
scanf("%" NAG_IFMT "%*[^\n] ", &incx);

xlen = MAX(1, 1 + (n - 1) * ABS(incx));
ap_len = n * (n + 1) / 2;

if (n > 0) {
/* Allocate memory */
if (!(ap = NAG_ALLOC(ap_len, Complex)) || !(x = NAG_ALLOC(xlen, Complex)))
{
printf("Allocation failure\n");
exit_status = -1;
goto END;
}
}
else {
printf("Invalid n\n");
exit_status = 1;
return exit_status;
}

/* Input matrix A and vector x */

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] ");
}
}
for (i = 0; i < xlen; ++i)
scanf(" ( %lf , %lf )%*[^\n] ", &x[i].re, &x[i].im);

/* nag_zhpr (f16sqc).
* Rank one update of complex Hermitian matrix,
* packed storage.
*/
nag_zhpr(order, uplo, n, alpha, x, incx, beta, ap, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_zhpr.\n%s\n", fail.message);
exit_status = 1;
goto END;
}
/* Print updated matrix A */
/* 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",
"Updated Matrix A", 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(ap);
NAG_FREE(x);

return exit_status;
}
```