```/* nag_1d_ratnl_eval (e01rbc) Example Program.
*
* NAGPRODCODE Version.
*
* Copyright 2016 Numerical Algorithms Group.
*
* Mark 26, 2016.
*/

#include <stdio.h>
#include <nag.h>
#include <nag_stdlib.h>
#include <nage01.h>

int main(void)
{
/* Scalars */
double f, x;
Integer exit_status, i, m;
NagError fail;

/* Arrays */
double *a = 0, *u = 0;

exit_status = 0;

INIT_FAIL(fail);

printf("nag_1d_ratnl_eval (e01rbc) Example Program Results\n");

/* Skip heading in data file */
scanf("%*[^\n] ");
m = 4;

/* Allocate memory */
if (!(a = NAG_ALLOC(m, double)) || !(u = NAG_ALLOC(m, double)))
{
printf("Allocation failure\n");
exit_status = -1;
goto END;
}

for (i = 1; i <= m; ++i)
scanf("%lf", &a[i - 1]);
scanf("%*[^\n] ");

for (i = 1; i <= m - 1; ++i)
scanf("%lf", &u[i - 1]);
scanf("%*[^\n] ");
scanf("%lf%*[^\n] ", &x);

printf("\n");
printf("x = %13.4e\n", x);

/* nag_1d_ratnl_eval (e01rbc).
* Interpolated values, evaluate rational interpolant
* computed by nag_1d_ratnl_interp (e01rac), one variable
*/
nag_1d_ratnl_eval(m, a, u, x, &f, &fail);
if (fail.code == NE_NOERROR) {
printf("\n");
printf("The value of R(x) is %13.4e\n", f);
}
else {
printf("Error from nag_1d_ratnl_eval (e01rbc).\n%s\n", fail.message);
exit_status = 1;
}
END:
NAG_FREE(a);
NAG_FREE(u);

return exit_status;
}
```