```/* nag_zcgesv (f07aqc) Example Program.
*
* Copyright 2017 Numerical Algorithms Group.
*
* Mark 26.2, 2017.
*/

#include <stdio.h>
#include <math.h>
#include <nag.h>
#include <nag_stdlib.h>
#include <nagf07.h>
#include <nagx04.h>

int main(void)
{
/* Scalars */
Integer exit_status = 0;
Integer i, iter, j, n, nrhs, pda, pdb, pdx;

/* Arrays */
Integer *ipiv = 0;
Complex *a = 0, *b = 0, *x = 0;

/* Nag Types */
NagError fail;
Nag_OrderType order;

INIT_FAIL(fail);

printf("nag_zcgesv (f07aqc) Example Program Results\n\n");
/* Skip heading in data file */
scanf("%*[^\n]");
scanf("%" NAG_IFMT "%" NAG_IFMT "%*[^\n]", &n, &nrhs);

if (n < 0 || nrhs < 0) {
printf("Invalid n or nrhs\n");
exit_status = 1;
return exit_status;
}

pda = n;
#ifdef NAG_COLUMN_MAJOR
pdb = n;
pdx = n;
order = Nag_ColMajor;
#define A(I, J) a[(J-1)*pda + I-1]
#define B(I, J) b[(J-1)*pdb + I-1]
#else
pdb = nrhs;
pdx = nrhs;
order = Nag_RowMajor;
#define A(I, J) a[(I-1)*pda + J-1]
#define B(I, J) b[(I-1)*pdb + J-1]
#endif

if (!(a = NAG_ALLOC(n * n, Complex)) ||
!(b = NAG_ALLOC(n * nrhs, Complex)) ||
!(x = NAG_ALLOC(n * nrhs, Complex)) || !(ipiv = NAG_ALLOC(n, Integer)))
{
printf("Allocation failure\n");
exit_status = -1;
goto END;
}
/* Read A and B from data file */
for (i = 1; i <= n; i++)
for (j = 1; j <= n; j++)
scanf(" ( %lf , %lf )", &A(i, j).re, &A(i, j).im);
scanf("%*[^\n]");
for (i = 1; i <= n; i++)
for (j = 1; j <= nrhs; j++)
scanf(" ( %lf , %lf )", &B(i, j).re, &B(i, j).im);
scanf("%*[^\n]");

/* Solve the equations Ax = b for x using
* nag_zcgesv (f07aqc)
* Mixed precision complex system solver
*/
nag_zcgesv(order, n, nrhs, a, pda, ipiv, b, pdb, x, pdx, &iter, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_zcgesv (f07aqc).\n%s\n", fail.message);
exit_status = 1;
goto END;
}
/* Print solution using nag_gen_complx_mat_print_comp (x04dbc). */
fflush(stdout);
nag_gen_complx_mat_print_comp(order, Nag_GeneralMatrix, Nag_NonUnitDiag, n,
nrhs, x, pdx, Nag_BracketForm, "%7.4f",
"Solution(s)", Nag_IntegerLabels, 0,
Nag_IntegerLabels, 0, 80, 0, 0, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_gen_complx_mat_print_comp (x04dbc).\n%s\n",
fail.message);
exit_status = 1;
goto END;
}

/* Print pivot indices */
printf("\n\nPivot indices\n");
for (i = 0; i < n; i++)
printf("%11" NAG_IFMT "%s", ipiv[i], (i + 1) % 4 ? " " : "\n");
printf("\n");

END:
NAG_FREE(a);
NAG_FREE(b);
NAG_FREE(x);
NAG_FREE(ipiv);

return exit_status;
}

#undef B
#undef A
```