NAG Library Manual, Mark 29.3
```/* nag_specfun_opt_jumpdiff_merton_price (s30jac) Example Program.
*
* Copyright 2023 Numerical Algorithms Group.
*
* Mark 29.3, 2023.
*/
#include <math.h>
#include <nag.h>
#include <stdio.h>
#include <string.h>

int main(void) {
/* Integer scalar and array declarations */
Integer exit_status = 0;
Integer i, j, m, n;
/* Double scalar and array declarations */
double jvol, lambda, r, s, sigma;
double *p = 0, *t = 0, *x = 0;
/* Character scalar and array declarations */
char put[8 + 1];
Nag_OrderType order;
NagError fail;
Nag_CallPut putnum;

INIT_FAIL(fail);

printf(
"nag_specfun_opt_jumpdiff_merton_price (s30jac) Example Program Results\n");
printf("Merton Jump-Diffusion Model\n\n");
/* Skip heading in data file */
scanf("%*[^\n] ");
scanf("%8s%*[^\n] ", put);
/*
* nag_enum_name_to_value (x04nac).
* Converts NAG enum member name to value
*/
putnum = (Nag_CallPut)nag_enum_name_to_value(put);
/* Read lambda, s, sigma, r, jvol */
scanf("%lf%lf%lf%lf%lf%*[^\n] ", &lambda, &s, &sigma, &r, &jvol);
scanf("%" NAG_IFMT "%" NAG_IFMT "%*[^\n] ", &m, &n);
#ifdef NAG_COLUMN_MAJOR
#define P(I, J) p[(J - 1) * m + I - 1]
order = Nag_ColMajor;
#else
#define P(I, J) p[(I - 1) * n + J - 1]
order = Nag_RowMajor;
#endif
if (!(p = NAG_ALLOC(m * n, double)) || !(t = NAG_ALLOC(n, double)) ||
!(x = NAG_ALLOC(m, double))) {
printf("Allocation failure\n");
exit_status = -1;
goto END;
}
/* Read array of strike/exercise prices, X */
for (i = 0; i < m; i++)
scanf("%lf ", &x[i]);
scanf("%*[^\n] ");
/* Read array of times to expiry */
for (i = 0; i < n; i++)
scanf("%lf ", &t[i]);
scanf("%*[^\n] ");
/*
* nag_specfun_opt_jumpdiff_merton_price (s30jac)
* Jump-diffusion, Merton's model, option pricing formula
*/
nag_specfun_opt_jumpdiff_merton_price(order, putnum, m, n, x, s, t, sigma, r,
lambda, jvol, p, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_specfun_opt_jumpdiff_merton_price (s30jac).\n%s\n",
fail.message);
exit_status = 1;
goto END;
}
if (putnum == Nag_Call)
printf("%s\n\n", "European Call :");
else if (putnum == Nag_Put)
printf("%s\n\n", "European Put :");
printf("%s%8.4f\n", "  Spot       = ", s);
printf("%s%8.4f\n", "  Volatility = ", sigma);
printf("%s%8.4f\n", "  Rate       = ", r);
printf("%s%8.4f\n", "  Jumps      = ", lambda);
printf("%s%8.4f\n", "  Jump vol   = ", jvol);
printf("\n");
printf("%s\n", "   Strike    Expiry    Option Price");
for (i = 1; i <= m; i++)
for (j = 1; j <= n; j++)
printf("%9.4f %9.4f %11.4f\n", x[i - 1], t[j - 1], P(i, j));

END:
NAG_FREE(p);
NAG_FREE(t);
NAG_FREE(x);

return exit_status;
}
```