NAG Library Manual, Mark 27.3
```/* D01BD_P0W_F C++ Header Example Program.
*
* Copyright 2021 Numerical Algorithms Group.
* Mark 27.3, 2021.
*/

#include <iostream>
#include <math.h>
#include <nag.h>
#include <nagx01.h>
#include <stdio.h>
#include <string>
using namespace std;

int main()
{
// Scalars
int exit_status = 0;

cout << "D01BD_P0W_F C++ Header Example Program Results\n\n";

// Skip first line of data file
string mystr;
getline(cin, mystr);

double a, b, epsabs, epsrel;
cin >> a;
cin >> b;
cin >> epsabs;
cin >> epsrel;

double  result, abserr, ruser[1];
Integer iuser[1];

ruser[0] = 10.0;
iuser[0] = 0;

const double &x,
double &      ret)
{
// dco/c++ used here to perform AD of the following
double            pi = X01AAC;
double prx, x2, s;
x2  = x * x;
prx = pi * ruser[0];
prx = prx * x;
s   = sin(prx);
ret = x2 * s;
iuser[0]++;
};

// Call the passive routine
Integer ifail = 0;

// Print inputs and primal outputs.
cout << "\n lower limit of integration (a) = " << a << endl;
cout << " upper limit of integration (b) = " << b << endl;
cout << " absolute accuracy requested    = " << epsabs << endl;
cout << " relative accuracy requested    = " << epsrel << endl;
cout.setf(ios::scientific, ios::floatfield);
cout.precision(4);
if (ifail >= 0)
{
cout << "\n approximation to the integral  : " << result << endl;
cout << " estimate of the absolute error : " << abserr << endl;
cout << " number of function evaluations : " << iuser[0] << endl;
}

return exit_status;
}
```