```/* nag_daxpby (f16ecc) Example Program.
*
* Copyright 2014 Numerical Algorithms Group.
*
* Mark 24, 2013.
*/

#include <stdio.h>
#include <nag.h>
#include <nag_stdlib.h>
#include <nagf16.h>
int main(void)
{
/* Scalars */
Integer  exit_status, i, incx, incy, n, xlen, ylen;
double   alpha, beta;
/* Arrays */
double   *x = 0, *y = 0;
/* Nag Types */
NagError fail;

exit_status = 0;
INIT_FAIL(fail);

printf("nag_daxpby (f16ecc) Example Program Results\n\n");

/* Skip heading in data file */
scanf("%*[^\n] ");
/* Read number of elements */
scanf("%ld%*[^\n] ", &n);
scanf("%ld%ld%*[^\n] ", &incx, &incy);
/* Read factors alpha and beta */
scanf("%lf%lf%*[^\n] ", &alpha, &beta);

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

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

/* Input vector x */
for (i = 0; i < xlen ; i = i + abs(incx))
scanf("%lf", &x[i]);
scanf("%*[^\n] ");

/* Input vector y */
for (i = 0; i < ylen; i = i + abs(incy))
scanf("%lf", &y[i]);
scanf("%*[^\n] ");

/* nag_daxpby (f16ecc).
* Performs y := alpha*x + beta*y  */
nag_daxpby(n, alpha, x, incx, beta, y, incy, &fail);

if (fail.code != NE_NOERROR)
{
printf("Error from nag_daxpby (f16ecc).\n%s\n", fail.message);
exit_status = 1;
goto END;
}

/* Print the result */
printf("Result of the scaled vector accumulation is\n");
printf("y = (");

for (i = 0; i < ylen - 1; i = i + abs(incy))
printf("%9.4f, ", y[i]);
printf("%9.4f)\n", y[ylen - 1]);

END:
NAG_FREE(x);
NAG_FREE(y);

return exit_status;
}
```