PETSc version 3.17.0
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# PetscBool

Logical variable. Actually an int 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()

### Level

beginner

### Location

include/petscsystypes.h

### Examples

src/dm/impls/stag/tutorials/ex2.c.html
src/dm/impls/stag/tutorials/ex3.c.html
src/dm/impls/stag/tutorials/ex6.c.html
src/dm/label/tutorials/ex1.c.html
src/ksp/ksp/tutorials/ex42.c.html
src/ksp/ksp/tutorials/ex43.c.html
src/ksp/ksp/tutorials/ex72.c.html
src/snes/tutorials/ex3.c.html
src/snes/tutorials/ex15.c.html
src/ts/utils/dmplexlandau/tutorials/ex2.c.html
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Index of all manual pages