:orphan: # PetscBool Logical variable. Actually an enum in C and a logical in Fortran. ## Synopsis ``` typedef enum { PETSC_FALSE, PETSC_TRUE } PetscBool; ``` ## Developer Note Why have `PetscBool`, why not use bool in C? The problem is that K and R C, C99 and C++ all have different mechanisms for boolean values. It is not easy to have a simple macro that that will work properly in all circumstances with all three mechanisms. ## See Also `PETSC_TRUE`, `PETSC_FALSE`, `PetscNot()`, `PetscBool3` ## Level beginner ## Location include/petscsystypes.h ## Examples src/dm/dt/dualspace/impls/lagrange/tutorials/ex1.c
src/dm/impls/stag/tutorials/ex2.c
src/dm/impls/stag/tutorials/ex3.c
src/dm/impls/stag/tutorials/ex4.c
src/dm/impls/stag/tutorials/ex6.c
src/dm/label/tutorials/ex1.c
src/ksp/ksp/tutorials/ex42.c
src/ksp/ksp/tutorials/ex43.c
src/ksp/ksp/tutorials/ex72.c
src/ts/utils/dmplexlandau/tutorials/ex2.c
--- [Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/include/petscsystypes.h) [Index of all Sys routines](index.md) [Table of Contents for all manual pages](/manualpages/index.md) [Index of all manual pages](/manualpages/singleindex.md)