```/* nag_blast_dsyr (f16ppc) Example Program.
*
* Copyright 2019 Numerical Algorithms Group.
*
* Mark 27.0, 2019.
*/

#include <stdio.h>
#include <nag.h>

int main(void)
{

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

/* Arrays */
double *a = 0, *x = 0;
char nag_enum_arg[40];

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

#ifdef NAG_COLUMN_MAJOR
#define A(I, J) a[(J-1)*pda + I - 1]
order = Nag_ColMajor;
#else
#define A(I, J) a[(I-1)*pda + J - 1]
order = Nag_RowMajor;
#endif

exit_status = 0;
INIT_FAIL(fail);

printf("nag_blast_dsyr (f16ppc) 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);

pda = n;

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

if (n > 0) {
/* Allocate memory */
if (!(a = NAG_ALLOC(pda * n, double)) || !(x = NAG_ALLOC(xlen, double)))
{
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", &A(i, j));
scanf("%*[^\n] ");
}
}
else {
for (i = 1; i <= n; ++i) {
for (j = 1; j <= i; ++j)
scanf("%lf", &A(i, j));
scanf("%*[^\n] ");
}
}
for (i = 0; i < xlen; ++i)
scanf("%lf%*[^\n] ", &x[i]);

/* nag_blast_dsyr (f16ppc).
* Rank one update of real symmetric matrix.
*
*/
nag_blast_dsyr(order, uplo, n, alpha, x, incx, beta, a, pda, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_blast_dsyr.\n%s\n", fail.message);
exit_status = 1;
goto END;
}

if (uplo == Nag_Upper) {
matrix = Nag_UpperMatrix;
}
else {
matrix = Nag_LowerMatrix;
}
/* Print updated matrix A */
/* nag_file_print_matrix_real_gen (x04cac).
* Print real general matrix (easy-to-use)
*/
fflush(stdout);
nag_file_print_matrix_real_gen(order, matrix, Nag_NonUnitDiag, n,
n, a, pda, "Updated Matrix A", 0, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_file_print_matrix_real_gen (x04cac).\n%s\n", fail.message);
exit_status = 1;
goto END;
}

END:
NAG_FREE(a);
NAG_FREE(x);

return exit_status;
}
```