```/* nag_specfun_legendre_p (s22aac) Example Program.
*
* Copyright 2019 Numerical Algorithms Group.
*
* NAG C Library
*
* Mark 27.0, 2019.
*
*/

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

int main(void)
{
Integer exit_status = 0, m, mode, n, nl;
NagError fail;
char *str = 0;
double *p = 0, x;

INIT_FAIL(fail);

/* Skip heading in data file */
scanf("%*[^\n] ");
printf("nag_specfun_legendre_p (s22aac) Example Program Results\n");
scanf("%" NAG_IFMT " %lf %" NAG_IFMT " %" NAG_IFMT "", &mode, &x, &m, &nl);
if (!(p = NAG_ALLOC(nl + 1, double)) || !(str = NAG_ALLOC(80, char)))
{
printf("Allocation failure\n");
exit_status = -1;
goto END;
}
if (mode == 1) {
if (m == 0)
strcpy(str, "Unnormalized Legendre function values\n");
else
strcpy(str, "Unnormalized associated Legendre function values\n");
}
else if (mode == 2) {
if (m == 0)
strcpy(str, "Normalized Legendre function values\n");
else
strcpy(str, "Normalized associated Legendre function values\n");
}

/* nag_specfun_legendre_p (s22aac).
* Legendre and associated Legendre functions of the first
* kind with real arguments
*/
nag_specfun_legendre_p(mode, x, m, nl, p, &fail);
printf("mode      x      m    nl\n");
printf("%3" NAG_IFMT "    %5.1f%6" NAG_IFMT "%6" NAG_IFMT "\n\n", mode, x,
m, nl);

if (fail.code == NE_NOERROR) {
printf("%s\n", str);
printf(" n      P(n)\n");
for (n = 0; n <= nl; ++n)
printf("%2" NAG_IFMT " %13.4e\n", n, p[n]);
}
else {
printf("Error from nag_specfun_legendre_p (s22aac).\n%s\n", fail.message);
exit_status = 1;
goto END;
}
END:
NAG_FREE(p);
NAG_FREE(str);
return exit_status;
}
```