```/* F01FJ_T1W_F C++ Header Example Program.
*
* Copyright 2019 Numerical Algorithms Group.
* Mark 27, 2019.
*/

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

int main(void)
{
int       exit_status = 0;
void      *ad_handle = 0;
Integer   ifail = 0;
NagError  fail;
INIT_FAIL(fail);

cout << "F01FJ_T1W_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           *ac=0;

a    =  new nagad_t1w_w_ctype [n*n];
ar   =  new nagad_t1w_w_rtype [n*n];
ai   =  new nagad_t1w_w_rtype [n*n];
ac   =  new Complex           [n*n];

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

// Create AD configuration data object
ifail = 0;

for (int l = 0; l<n; ++l) {
{
double  inc = 1.0;
Integer k = l + l*n;
}
for (int i = 0; i<n; ++i) {
for (int j = 0; j<n; ++j) {
Integer k = i + j*n;
a[k].real(ar[k]);
a[k].imag(ai[k]);
}
}
// Find log(A)
ifail = 0;

if (l==0) {
// Print log(A)
for (int i = 0; i<n; i++) {
for (int j = 0; j<n; j++) {
int k = i + j*n;

}
}

cout << endl;
x04dac(Nag_ColMajor,Nag_GeneralMatrix,Nag_NonUnitDiag,n,n,ac,n,
"  Log(A)",0,&fail);
}
for (int j=0; j<n; j++) {
Integer k = j + j*n, p = j + l*n;
air = real(a[k]);
aii = imag(a[k]);
}
{
double  zero = 0.0;
Integer k = l + l*n;
}
}
cout << "\n\n Derivatives calculated: First order tangents\n";
cout << " Computational mode    : algorithmic\n";
cout << "\n Derivatives of diagional of log(A) w.r.t diagonal of imag(A):\n";

// Print derivatives
cout << endl;
x04dac(Nag_ColMajor,Nag_GeneralMatrix,Nag_NonUnitDiag,n,n,ac,n,
"     d(logA(i,i)/dImag(A(j,j))",0,&fail);

// Remove computational data object
ifail = 0;