```/* nag_1d_spline_deriv (e02bcc) Example Program.
*
* NAGPRODCODE Version.
*
* Copyright 2016 Numerical Algorithms Group.
*
* Mark 26, 2016.
*
*/

#include <nag.h>
#include <stdio.h>
#include <nag_stdlib.h>
#include <nage02.h>

int main(void)
{
Integer exit_status = 0, i, j, l, m, ncap, ncap7;
NagError fail;
Nag_DerivType derivs;
Nag_Spline spline;
double s[4], x;

INIT_FAIL(fail);

/* Initialize spline */
spline.lamda = 0;
spline.c = 0;

printf("nag_1d_spline_deriv (e02bcc) Example Program Results\n");
scanf("%*[^\n]"); /* Skip heading in data file */
while (scanf("%" NAG_IFMT "%" NAG_IFMT "", &ncap, &m) != EOF)
{
if (m <= 0) {
printf("Invalid m.\n");
exit_status = 1;
return exit_status;
}
if (ncap > 0) {
ncap7 = ncap + 7;
spline.n = ncap7;
if (!(spline.c = NAG_ALLOC(ncap7, double)) ||
!(spline.lamda = NAG_ALLOC(ncap7, double)))
{
printf("Allocation failure\n");
exit_status = -1;
goto END;
}
}
else {
printf("Invalid ncap.\n");
exit_status = 1;
return exit_status;
}
for (j = 0; j < ncap7; j++)
scanf("%lf", &(spline.lamda[j]));
for (j = 0; j < ncap + 3; j++)
scanf("%lf", &(spline.c[j]));
printf("        x             Spline    1st deriv  "
"2nd deriv   3rd deriv");
for (i = 1; i <= m; i++) {
scanf("%lf", &x);
derivs = Nag_LeftDerivs;
for (j = 1; j <= 2; j++) {
/* nag_1d_spline_deriv (e02bcc).
* Evaluation of fitted cubic spline, function and
* derivatives
*/
nag_1d_spline_deriv(derivs, x, s, &spline, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_1d_spline_deriv (e02bcc).\n%s\n",
fail.message);
exit_status = 1;
goto END;
}

if (derivs == Nag_LeftDerivs) {
printf("\n\n%11.4f   Left", x);
for (l = 0; l < 4; l++)
printf("%11.4f", s[l]);
}
else {
printf("\n%11.4f  Right", x);
for (l = 0; l < 4; l++)
printf("%11.4f", s[l]);
}
derivs = Nag_RightDerivs;
}
}
printf("\n");
END:
NAG_FREE(spline.c);
NAG_FREE(spline.lamda);
}
return exit_status;
}
```