NAG Library Manual, Mark 27.3
```/* F07AW_P0W_F C++ Header Example Program.
*
* Copyright 2021 Numerical Algorithms Group.
* Mark 27.3, 2021.
*/

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

int main()
{
int               exit_status = 0;
Integer           ifail = 0;

cout << "F07AW_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;

// Allocate arrays containing A and its factorized form, B
// and the solution X.
Complex *a = 0, *work = 0;
Integer *ipiv  = 0;
Integer  lwork = 64 * n;
a              = new Complex[n * n];
work           = new Complex[lwork];
ipiv           = new Integer[n];

// Read the matrix A, register and copy
double dr, di;
double aa;
for (int i = 0; i < n; ++i)
{
for (int j = 0; j < n; ++j)
{
Integer k = i + j * n;
cin >> dr >> di;
a[k].re = dr;
a[k].im = di;
}
}

// Print matrix A
NagError fail;
INIT_FAIL(fail);
x04dac(Nag_ColMajor, Nag_GeneralMatrix, Nag_NonUnitDiag, n, n, a, n, "  A", 0,
&fail);

// Factorize the matrix A
ifail = 0;

// Invert A
ifail = 0;

cout << endl;
// NagError  fail;
INIT_FAIL(fail);
x04dac(Nag_ColMajor, Nag_GeneralMatrix, Nag_NonUnitDiag, n, n, a, n,
"  Inverse", 0, &fail);

delete[] a;
delete[] work;
delete[] ipiv;
return exit_status;
}
```