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# PetscIsNormalReal
Returns `PETSC_TRUE` if the input value satisfies `isnormal()` 
## Synopsis
```
#if defined(PETSC_USE_REAL___FLOAT128) || defined(PETSC_USE_REAL___FP16)
PetscBool PetscIsNormalReal(PetscReal a)
```

## Input Parameter

- ***a -*** the `PetscReal` Value





## Developer Notes
Uses the C99 standard `isnormal()` on systems where they exist.

Uses `isnormalq()` with `__float128`

Otherwise always returns true


## See Also
 `PetscIsInfReal()`, `PetscIsNanReal()`

## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/utils/mathinf.c.html#PetscIsNormalReal">src/sys/utils/mathinf.c</A>


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


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