NAG Library Manual, Mark 27.2
```/* F07CE_P0W_F C++ Header Example Program.
*
* Copyright 2021 Numerical Algorithms Group.
* Mark 27.2, 2021.
*/

#include <iostream>
#include <nag.h>
#include <nagx04.h>
#include <stdio.h>
#include <string>
using namespace std;

int main(void)
{
int     exit_status = 0;
Integer nrhs = 1, ifail = 0;

cout << "F07CE_P0W_F C++ Header Example Program Results\n\n";
// Skip heading in data file
string mystr;
getline(cin, mystr);

// Read problem size and number of right-hand-sides
Integer n;
cin >> n;
cin >> nrhs;

// Allocate arrays containing A and its factorized form, B
// and the solution X.
double * dl = 0, *d = 0, *du = 0, *du2 = 0, *x = 0;
Integer *ipiv = 0;
Integer  n1 = n - 1, n2 = n - 2;
dl   = new double[n1];
d    = new double[n];
du   = new double[n1];
du2  = new double[n2];
ipiv = new Integer[n];
x    = new double[n * nrhs];

// Read the tridiagonal matrix A and right hand side B, register and copy
for (int i = 0; i < n1; i++)
{
cin >> du[i];
}
for (int i = 0; i < n; i++)
{
cin >> d[i];
}
for (int i = 0; i < n1; i++)
{
cin >> dl[i];
}
for (int i = 0; i < n; i++)
{
for (int j = 0; j < nrhs; j++)
{
int k = i + j * n;
cin >> x[k];
}
}

// Factorize the tridiagonal matrix A
ifail = 0;

// Solve the equations Ax = b for x
ifail = 0;
nag::ad::f07ce(ad_handle, "N", n, nrhs, dl, d, du, du2, ipiv, x, n, ifail);

cout << "\n\n";
NagError fail;
INIT_FAIL(fail);
x04cac(Nag_ColMajor, Nag_GeneralMatrix, Nag_NonUnitDiag, n, nrhs, x, n,
"  Solution", 0, &fail);

delete[] dl;
delete[] d;
delete[] du;
delete[] du2;
delete[] ipiv;
delete[] x;
return exit_status;
}
```