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# PetscOptionsBoolGroupBegin
First in a series of logical queries on the options database for which at most a single value can be true. 
## Synopsis
```
#include "petscsys.h"
PetscErrorCode PetscOptionsBoolGroupBegin(const char opt[],const char text[],const char man[],PetscBool  *flg)
```
Logically Collective on the communicator passed in `PetscOptionsBegin()`


## Input Parameters

- ***opt -*** option name
- ***text -*** short string that describes the option
- ***man -*** manual page with additional information on option



## Output Parameter

- ***flg -*** whether that option was set or not





## Notes
Must be between a `PetscOptionsBegin()` and a `PetscOptionsEnd()`

Must be followed by 0 or more `PetscOptionsBoolGroup()`s and `PetscOptionsBoolGroupEnd()`


## See Also
 `PetscOptionsGetInt()`, `PetscOptionsGetReal()`,
`PetscOptionsHasName()`, `PetscOptionsGetIntArray()`, `PetscOptionsGetRealArray()`, `PetscOptionsBool()`,
`PetscOptionsName()`, `PetscOptionsBegin()`, `PetscOptionsEnd()`, `PetscOptionsHeadBegin()`,
`PetscOptionsStringArray()`, `PetscOptionsRealArray()`, `PetscOptionsScalar()`,
`PetscOptionsBoolGroupBegin()`, `PetscOptionsBoolGroup()`, `PetscOptionsBoolGroupEnd()`,
`PetscOptionsFList()`, `PetscOptionsEList()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/objects/aoptions.c.html#PetscOptionsBoolGroupBegin">src/sys/objects/aoptions.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/sys/objects/aoptions.c)


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