NAG Library Manual, Mark 27.2
Interfaces:  FL   CL   CPP   AD
```/* nag_quad_dim1_gauss_wres (d01tbc) Example Program.
*
* Copyright 2021 Numerical Algorithms Group.
*
* Mark 27.2, 2021.
*/

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

int main(void) {
Integer exit_status = 0;
Integer n;
double a, b;
Integer i;
Nag_QuadType quadtype;
NagError fail;
double *abscis = 0, *weight = 0;

INIT_FAIL(fail);

printf("nag_quad_dim1_gauss_wres (d01tbc) Example Program Results\n");
/* Skip heading in data file */
scanf("%*[^\n] ");
/* Input a, b and n */
scanf("%lf %lf", &a, &b);
scanf("%" NAG_IFMT "%*[^\n] ", &n);
quadtype = Nag_Quad_Gauss_Laguerre_Adjusted;

if (!(abscis = NAG_ALLOC(n, double)) || !(weight = NAG_ALLOC(n, double))) {
printf("Allocation failure\n");
exit_status = -1;
goto END;
}

/* nag_quad_dim1_gauss_wres (d01tbc).
* Pre-computed weights and abscissae for
* Gaussian quadrature rules, restricted choice of rule.
*/
nag_quad_dim1_gauss_wres(quadtype, a, b, n, weight, abscis, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_quad_dim1_gauss_wres (d01tbc).\n%s\n", fail.message);
exit_status = 1;
goto END;
}

printf("\nLaguerre formula, %3" NAG_IFMT " points\n\n"
"    Abscissae        Weights\n\n",
n);
for (i = 0; i < n; i++) {
printf("%15.6e", abscis[i]);
printf("%15.6e\n", weight[i]);
}
printf("\n");

END:
NAG_FREE(abscis);
NAG_FREE(weight);

return exit_status;
}
```