NAG Library Manual, Mark 27.2
```/* F06YA_P0W_F C++ Header Example Program.
*
* Copyright 2021 Numerical Algorithms Group.
* Mark 27.2, 2021.
*/

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

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

cout << "F06YA_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 m, n, k;
cin >> m >> n >> k;
double alpha, beta;
cin >> alpha >> beta;

// Allocate arrays containing A and its factorized form, B
// and the solution X.
double *a = 0, *b = 0, *c = 0;
a = new double[k * m];
b = new double[n * k];
c = new double[m * n];

double dd;
for (int i = 0; i < k; ++i)
{
for (int j = 0; j < m; ++j)
{
cin >> dd;
Integer l = i + j * k;
a[l]      = dd;
}
}
for (int i = 0; i < n; ++i)
{
for (int j = 0; j < k; ++j)
{
cin >> dd;
Integer l = i + j * n;
b[l]      = dd;
}
}
for (int i = 0; i < m * n; ++i)
{
c[i] = 1.0;
}

//  C = beta*C + alpha*A^T*B^T
ifail = 0;
nag::ad::f06ya(ad_handle, "T", "T", m, n, k, alpha, a, k, b, n, beta, c, m,
ifail);

cout << endl;
NagError fail;
INIT_FAIL(fail);
x04cac(Nag_ColMajor, Nag_GeneralMatrix, Nag_NonUnitDiag, m, n, c, m,
"  Matrix C after update", 0, &fail);

delete[] a;
delete[] b;
delete[] c;

return exit_status;
}
```