```/* nag_zgerfs (f07avc) Example Program.
*
* NAGPRODCODE Version.
*
* Copyright 2016 Numerical Algorithms Group.
*
* Mark 26, 2016.
*/

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

int main(void)
{
/* Scalars */
Integer berr_len, i, ferr_len, ipiv_len, j, n, nrhs;
Integer pda, pdaf, pdb, pdx;
Integer exit_status = 0;
NagError fail;
Nag_OrderType order;
/* Arrays */
Complex *a = 0, *af = 0, *b = 0, *x = 0;
double *berr = 0, *ferr = 0;
Integer *ipiv = 0;

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

INIT_FAIL(fail);

printf("nag_zgerfs (f07avc) Example Program Results\n\n");

/* Skip heading in data file */
scanf("%*[^\n] ");
scanf("%" NAG_IFMT "%" NAG_IFMT "%*[^\n] ", &n, &nrhs);
#ifdef NAG_COLUMN_MAJOR
pda = n;
pdaf = n;
pdb = n;
pdx = n;
#else
pda = n;
pdaf = n;
pdb = nrhs;
pdx = nrhs;
#endif
ipiv_len = n;
ferr_len = n;
berr_len = nrhs;

/* Allocate memory */
if (!(a = NAG_ALLOC(n * n, Complex)) ||
!(af = NAG_ALLOC(n * n, Complex)) ||
!(b = NAG_ALLOC(n * nrhs, Complex)) ||
!(x = NAG_ALLOC(n * n, Complex)) ||
!(berr = NAG_ALLOC(berr_len, double)) ||
!(ferr = NAG_ALLOC(ferr_len, double)) ||
!(ipiv = NAG_ALLOC(ipiv_len, Integer)))
{
printf("Allocation failure\n");
exit_status = -1;
goto END;
}

/* Read A and B from data file, and copy A to AF and B to X */
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] ");

for (i = 1; i <= n; ++i) {
for (j = 1; j <= n; ++j) {
AF(i, j).re = A(i, j).re;
AF(i, j).im = A(i, j).im;
}
}
for (i = 1; i <= n; ++i) {
for (j = 1; j <= nrhs; ++j) {
X(i, j).re = B(i, j).re;
X(i, j).im = B(i, j).im;
}
}
/* Factorize A in the array AF */
/* nag_zgetrf (f07arc).
* LU factorization of complex m by n matrix
*/
nag_zgetrf(order, n, n, af, pdaf, ipiv, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_zgetrf (f07arc).\n%s\n", fail.message);
exit_status = 1;
goto END;
}
/* Compute solution in the array X */
/* nag_zgetrs (f07asc).
* Solution of complex system of linear equations, multiple
* right-hand sides, matrix already factorized by nag_zgetrf
* (f07arc)
*/
nag_zgetrs(order, Nag_NoTrans, n, nrhs, af, pdaf, ipiv, x, pdx, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_zgetrs (f07asc).\n%s\n", fail.message);
exit_status = 1;
goto END;
}
/* Improve solution, and compute backward errors and */
/* estimated bounds on the forward errors */
/* nag_zgerfs (f07avc).
* Refined solution with error bounds of complex system of
* linear equations, multiple right-hand sides
*/
nag_zgerfs(order, Nag_NoTrans, n, nrhs, a, pda, af, pdaf, ipiv, b, pdb, x,
pdx, ferr, berr, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_zgerfs (f07avc).\n%s\n", fail.message);
exit_status = 1;
goto END;
}

/* Print solution */
/* nag_gen_complx_mat_print_comp (x04dbc).
* Print complex general matrix (comprehensive)
*/
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;
}

printf("\nBackward errors (machine-dependent)\n");

for (j = 1; j <= nrhs; ++j)
printf("%11.1e%s", berr[j - 1], j % 4 == 0 ? "\n" : " ");
printf("\nEstimated forward error bounds (machine-dependent)\n");
for (j = 1; j <= nrhs; ++j)
printf("%11.1e%s", ferr[j - 1], j % 4 == 0 || j == nrhs ? "\n" : " ");
END:
NAG_FREE(a);
NAG_FREE(af);
NAG_FREE(b);
NAG_FREE(x);
NAG_FREE(berr);
NAG_FREE(ferr);
NAG_FREE(ipiv);
return exit_status;
}
```