```/* G02AA_P0W_F C++ Header Example Program.
*
* Copyright 2020 Numerical Algorithms Group.
* Mark 27.1, 2020.
*/

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

int main(void)
{
Integer exit_status = 0;

cout << "G02AA_T1W_F C++ Example Program Results\n\n";

// Skip heading in data file
string mystr;
getline (cin, mystr);

Integer n;
cin >> n;

double  *g = 0, *x = 0;
Integer pdg = n;
Integer pdx = n;
g = new double [n * n];
x = new double [n * n];

/* Read in the matrix g */
for (int i = 0; i < n; i++) {
for (int j = 0; j < n; j++) {
cin >> g[i+j*n];
}
}

/* Set up method parameters */
double  errtol = 1.00e-7;
Integer maxits = 200;
Integer maxit = 10;

Integer ifail = 0;
Integer feval, iter;
double  nrmgrd;
g02aa_p0w_f_(ad_handle, g, pdg, n, errtol, maxits, maxit, x, pdx,
iter, feval, nrmgrd, ifail);

NagError  fail;
INIT_FAIL(fail);
x04cac(Nag_ColMajor,Nag_GeneralMatrix,Nag_NonUnitDiag,n,n,x,pdx,
"     Nearest Correlation Matrix",0,&fail);

cout << "\n\n Number of Newton steps taken  : " << iter << "\n";
cout <<     " Number of function evaluations:" << feval << "\n";
if (nrmgrd > errtol) {
cout << " Norm of gradient of last Newton step: ";
cout.width(12); cout << nrmgrd << endl;
}

delete [] g;
delete [] x;

return exit_status;
}
```