FloatingPointExceptions

VTKExamples/Cxx/SimpleOperations/FloatingPointExceptions

Description

This example makes the illegal division by zero produce an error: Error: Floating point exception detected. Signal 8 rather than simply store "inf" in y.

Code

FloatingPointExceptions.cxx

#include <vtkFloatingPointExceptions.h>

// Avoid the "potential divide by 0" warning from the Microsoft
// compiler, since this example intentionally divides by 0
#ifdef _MSC_VER
#pragma warning (disable: 4723)
#endif

int main(int, char *[])
{
  // Disabled by default with gcc or visual studio.
  // Enabled by default by Borland CC.
  vtkFloatingPointExceptions::Enable(); 

  double x = 0.0;
  double y = 1.0/x; // floating-point exception

  std::cout << "x: " << x << " y: " << y << std::endl;

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(FloatingPointExceptions)

find_package(VTK COMPONENTS 
  vtkCommonCore QUIET)
if (NOT VTK_FOUND)
  message("Skipping FloatingPointExceptions: ${VTK_NOT_FOUND_MESSAGE}")
  return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
  # old system
  include(${VTK_USE_FILE})
  add_executable(FloatingPointExceptions MACOSX_BUNDLE FloatingPointExceptions.cxx )
  target_link_libraries(FloatingPointExceptions PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(FloatingPointExceptions MACOSX_BUNDLE FloatingPointExceptions.cxx )
  target_link_libraries(FloatingPointExceptions PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS FloatingPointExceptions
    MODULES ${VTK_LIBRARIES}
    )
endif () 

Download and Build FloatingPointExceptions

Click here to download FloatingPointExceptions and its CMakeLists.txt file. Once the tarball FloatingPointExceptions.tar has been downloaded and extracted,

cd FloatingPointExceptions/build 

If VTK is installed:

cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Build the project:

make

and run it:

./FloatingPointExceptions

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.