static char help[] = "Tests binary MatView() for MPIDENSE matrices \n\n";

#include <petscmat.h>

int main(int argc, char **args)
{
  Mat         A;
  PetscViewer viewer;
  char        inputfile[256], outputfile[256];
  PetscBool   flg;

  PetscFunctionBeginUser;
  PetscCall(PetscInitialize(&argc, &args, NULL, help));
  PetscCall(PetscOptionsGetString(NULL, NULL, "-inputfile", inputfile, sizeof(inputfile), &flg));
  PetscCall(PetscOptionsGetString(NULL, NULL, "-outputfile", outputfile, sizeof(outputfile), &flg));
  PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD, inputfile, FILE_MODE_READ, &viewer));
  PetscCall(MatCreate(PETSC_COMM_WORLD, &A));
  PetscCall(MatSetType(A, MATDENSE));
  PetscCall(MatLoad(A, viewer));
  PetscCall(PetscViewerDestroy(&viewer));
  PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD, outputfile, FILE_MODE_WRITE, &viewer));
  PetscCall(MatView(A, viewer));
  PetscCall(PetscViewerDestroy(&viewer));
  PetscCall(PetscFinalize());
  return 0;
}