Actual source code: ex1.c

      1: static char help[] = "Appends to an ASCII file.\n\n";

      3: #include <petscviewer.h>

      5: int main(int argc, char **args)
      6: {
      7:   PetscViewer viewer;
      8:   PetscInt    i;

     10:   PetscFunctionBeginUser;
     11:   PetscCall(PetscInitialize(&argc, &args, NULL, help));
     12:   PetscCall(PetscViewerCreate(PETSC_COMM_WORLD, &viewer));
     13:   PetscCall(PetscViewerSetType(viewer, PETSCVIEWERASCII));
     14:   PetscCall(PetscViewerFileSetMode(viewer, FILE_MODE_APPEND));
     15:   PetscCall(PetscViewerFileSetName(viewer, "test.txt"));
     16:   for (i = 0; i < 10; ++i) PetscCall(PetscViewerASCIIPrintf(viewer, "test line %" PetscInt_FMT "\n", i));
     17:   PetscCall(PetscViewerDestroy(&viewer));
     18:   PetscCall(PetscFinalize());
     19:   return 0;
     20: }

     22: /*TEST

     24:    test:
     25:      output_file: output/empty.out

     27: TEST*/