# PetscViewerASCIIPrintf
Prints to a file, only from the first processor in the PetscViewer 
## Synopsis
```
#include "petscviewer.h" 
PetscErrorCode PetscViewerASCIIPrintf(PetscViewer viewer, const char format[], ...)
```
Not Collective, but only first processor in set has any effect


## Input Parameters

- ***viewer -*** obtained with `PetscViewerASCIIOpen()`
- ***format -*** the usual printf() format string





## Fortran Note
The call sequence is `PetscViewerASCIIPrintf`(PetscViewer, character(*), int ierr) from Fortran.
That is, you can only pass a single character string from Fortran.


## See Also
 `PetscPrintf()`, `PetscSynchronizedPrintf()`, `PetscViewerASCIIOpen()`,
`PetscViewerASCIIPushTab()`, `PetscViewerASCIIPopTab()`, `PetscViewerASCIISynchronizedPrintf()`,
`PetscViewerCreate()`, `PetscViewerDestroy()`, `PetscViewerSetType()`, `PetscViewerASCIIGetPointer()`, `PetscViewerASCIIPushSynchronized()`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/classes/viewer/impls/ascii/filev.c.html#PetscViewerASCIIPrintf">src/sys/classes/viewer/impls/ascii/filev.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/classes/viewer/tutorials/ex1.c.html">src/sys/classes/viewer/tutorials/ex1.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/utils/tagger/tutorials/ex1.c.html">src/vec/vec/utils/tagger/tutorials/ex1.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/is/sf/tutorials/ex1.c.html">src/vec/is/sf/tutorials/ex1.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/is/sf/tutorials/ex1f.F90.html">src/vec/is/sf/tutorials/ex1f.F90.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/label/tutorials/ex1.c.html">src/dm/label/tutorials/ex1.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/label/tutorials/ex1f90.F90.html">src/dm/label/tutorials/ex1f90.F90.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/field/tutorials/ex1.c.html">src/dm/field/tutorials/ex1.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex68.c.html">src/ksp/ksp/tutorials/ex68.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex69.c.html">src/ksp/ksp/tutorials/ex69.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex15.c.html">src/snes/tutorials/ex15.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex48.c.html">src/snes/tutorials/ex48.c.html</A><BR>


---
[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/sys/classes/viewer/impls/ascii/filev.c)


[Index of all Viewer routines](index.md)  
[Table of Contents for all manual pages](/docs/manualpages/index.md)  
[Index of all manual pages](/docs/manualpages/singleindex.md)  
