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Webinar: Parsing C++ - 10.10

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Examples of errors detected by the V636…

Examples of errors detected by the V636 diagnostic

V636. Expression was implicitly cast from integer type to real type. Consider using an explicit type cast to avoid overflow or loss of a fractional part.


CxImage

V636 The '16 / 116' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. color.c 125


psd_argb_color psd_alab_to_color(....)
{
  psd_double var_z;
  ....
  var_z = ( var_z - 16 / 116 ) / 7.787;
}

According to the rules of integer division, 16 / 116 == 0. That's why the result will be incorrect.


libevent

V636 The 'cfg_grouplimit / cfg_n_connections' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. test-ratelim.c 242


static int cfg_grouplimit = 0;
static int cfg_n_connections = 30;

static int
test_ratelimiting(void)
{
  double expected_avg_persec = -1.0;
  ....
  expected_avg_persec = cfg_grouplimit / cfg_n_connections;
  ....
}

Windows 8 Driver Samples

V636 The '22 / 7' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. kcs.c 239


NTSTATUS
KcsAddTrignometricInstance (....)
{
  ....
  Angle = (double)(Timestamp.QuadPart / 400000) *
          (22/7) / 180;
  ....
}

Trans-Proteomic Pipeline

V636 The 'used_count_ / rts_.size()' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. rtcalculator.cxx 6406


double RTCalculator::getUsedForGradientRate() {
  if (rts_.size() > 0)
    return used_count_ / rts_.size();
  return 0.;
}

Similar errors can be found in some other places:

  • V636 The 'totColor / 2' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. cgi_pep3d_xml.cxx 3203
  • V636 The 'totColor / 2' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. cgi_pep3d_xml.cxx 3204
  • V636 The expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. asapratiopeptideparser.cxx 4108

TinyCAD

V636 The 'iwidth / actual_width[i]' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. context.cpp 712


void CContext::TextOut(....)
{
  int *actual_width = new int[len];
  double max_adjust = max_char_adjust;
  int iwidth;
  ....
  if (iwidth / actual_width[i] < 1.0 - max_adjust)
  ....
}

Similar errors can be found in some other places:

  • V636 The 'iwidth / actual_width[i]' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. context.cpp 717
  • V636 The '3 / 2' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. drawjunction.cpp 179
  • V636 The '3 / 2' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. drawjunction.cpp 185
  • And 4 additional diagnostic messages.

OpenMS

V636 The '1 / (t + 1)' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. masstracedetection.c 129


typedef size_t Size;
typedef double DoubleReal;

void updateMeanEstimate(const DoubleReal & x_t,
                        DoubleReal & mean_t, Size t)
{
  DoubleReal tmp(mean_t);
  tmp = mean_t + (1 / (t + 1)) * (x_t - mean_t);
  mean_t = tmp;
}

Geant4 software

V636 The 'sTrk1 / qTrk1' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. g4xaqmtotal.cc 103


G4double G4XAqmTotal::CrossSection(
  const G4KineticTrack& trk1, const G4KineticTrack& trk2) const
{
  ....
  G4int sTrk1 = ....;
  G4int qTrk1 = ....;

  G4double sRatio1 = 0.;
  if (qTrk1 != 0) sRatio1 = sTrk1 / qTrk1;
  ....
}

Similar errors can be found in some other places:

  • V636 The 'Z * Z / A' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. g4equilibriumevaporator.cc 255
  • V636 The 'Z / 2' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. g4pairingcorrection.cc 68
  • V636 The 'Z / 2' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. g4pairingcorrection.cc 79
  • And 13 additional diagnostic messages.

Source Engine SDK

V636 The expression was implicitly cast from 'int' type to 'float' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. Client (HL2) detailobjectsystem.cpp 1480


virtual int GetMappingWidth( ) = 0;
virtual int GetMappingHeight( ) = 0;

void CDetailObjectSystem::LevelInitPreEntity()
{
  ....
  float flRatio = pMat->GetMappingWidth() /
                  pMat->GetMappingHeight();
  ....
}

Similar errors can be found in some other places:

  • V636 The 'pIcon->Width() / 2' expression was implicitly cast from 'int' type to 'float' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. Client (HL2) c_vehicle_airboat.cpp 276
  • V636 The 'pIcon->Height() / 2' expression was implicitly cast from 'int' type to 'float' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. Client (HL2) c_vehicle_airboat.cpp 277
  • V636 The 'ScreenWidth() / 2' expression was implicitly cast from 'int' type to 'float' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. Client (HL2) c_prop_vehicle.cpp 283
  • And 20 additional diagnostic messages.

Coin3D

V636 The expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid overflow. An example: double A = (double)(X) * Y;. sbutmprojection.cpp 56


void
SbUTMProjection::project(....) const
{
  ....
  //Make sure the longitude is between -180.00 .. 179.9
  double LongTemp =
    (int(LongRad.deg())+180)-
    int((int(LongRad.deg())+180)/360)*360-180;
  ....
}

V8 JavaScript Engine

V636 The 'total_size_ / 1024' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. hydrogen.cc 11023


unsigned total_size_;
double source_size_in_kb =
  static_cast<double>(source_size_) / 1024;

void HStatistics::Print() {
  ....
  double normalized_size_in_kb = source_size_in_kb > 0
      ? total_size_ / 1024 / source_size_in_kb
      : 0;
  PrintF("%32s %8.3f ms           %7.3f kB allocated\n",
         "Average per kB source",
         normalized_time, normalized_size_in_kb);
}

Similar errors can be found in some other places:

  • V636 The expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. gregocal.cpp 698

Data Distribution Service

V636 The 'ACE_CU64_TO_CU32(this->min_) / gsf' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. latency_stats.h 73


inline ACE_UINT32
ACE_CU64_TO_CU32 (ACE_UINT64 n)
{
  return static_cast<ACE_UINT32> (n);
}

inline void
Latency_Stats::dump_results (const ACE_TCHAR *test_name,
                             const ACE_TCHAR *sub_test)
{
  ....
  double min_usec = ACE_CU64_TO_CU32 (this->min_) / gsf;
  ....
}

Similar errors can be found in some other places:

  • V636 The 'ACE_CU64_TO_CU32(this->max_) / gsf' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. latency_stats.h 74
  • V636 The 'ACE_CU64_TO_CU32(avg) / gsf' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. latency_stats.h 75
  • V636 The 'ACE_CU64_TO_CU32(dev) / (gsf * gsf)' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. latency_stats.h 76

FlightGear

V636 The '(rand() % 100) / 100' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. aiaircraft.cxx 780


bool FGAIAircraft::fpExecutable(time_t now) {
  double rand_exec_time = (rand() % 100) / 100;
  return (dt_count > (0.1+rand_exec_time)) &&
          (fp->isActive(now));
}

Similar errors can be found in some other places:

  • V636 The '_height / 2' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. mapwidget.cxx 759

Micro-Manager

V636 The 'tr / 10' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. SpectralLMM5Interface.cpp 198


int SpectralLMM5Interface::GetTransmission(....,
                                           double& transmission)
{
  ....
  int16_t tr = 0;
  memcpy(&tr, answer + 1, 2);
  tr = ntohs(tr);
  transmission = tr/10;
  ....
}

FFmpeg

V636 The 'i / 4' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. mpegaudio_tablegen.h 48


static void mpegaudio_tableinit(void)
{
  int i, value, exponent;
  for (i = 1; i < TABLE_4_3_SIZE; i++) {
    double value = i / 4;
  ....
}

Similar errors can be found in some other places:

  • V636 The 'sad / nb_sad' expression was implicitly cast from 'long' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. f_select.c 282
  • V636 The 'width / 2' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. vf_deshake.c 309
  • V636 The 'height / 2' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. vf_deshake.c 310
  • And 5 additional diagnostic messages.

Qt

V636 The 'packet.pkOrientation.orAzimuth / 10' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. qwindowstabletsupport.cpp 467


typedef struct tagORIENTATION {
  int orAzimuth;
  int orAltitude;
  int orTwist;
} ORIENTATION, *PORIENTATION,
  NEAR *NPORIENTATION, FAR *LPORIENTATION;

bool QWindowsTabletSupport::translateTabletPacketEvent()
{
  ....
  const double radAzim =
    (packet.pkOrientation.orAzimuth / 10) * (M_PI / 180);
  ....
}

Similar errors can be found in some other places:

  • V636 The 'distance / elapsedTime' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. qstandardgestures.cpp 347
  • V636 The 'aiRowEst[0] / 2' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. sqlite3.c 107835
  • V636 The 'm_iconSize.width() / 3' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. window.cpp 111
  • And 48 additional diagnostic messages.

Tesseract

V636 The '1 / 2' expression was implicitly cast from 'int' type to 'float' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. libtesseract303 language_model.cpp 1163


void LanguageModel::FillConsistencyInfo(....)
{
  ....
  float gap_ratio = expected_gap / actual_gap;
  if (gap_ratio < 1/2 || gap_ratio > 2) {
    consistency_info->num_inconsistent_spaces++;
  ....
}

Similar errors can be found in some other places:

  • V636 The expression was implicitly cast from 'int' type to 'float' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. libtesseract303 baselinedetect.cpp 110
  • V636 The 'fore_cnt / hgt_' expression was implicitly cast from 'int' type to 'float' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. libtesseract303 bmp_8.cpp 983
  • V636 The expression was implicitly cast from 'int' type to 'float' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. libtesseract303 cjkpitch.cpp 553
  • And 4 additional diagnostic messages.

Cocos2d-x

V636 The 'rand() / 0x7fff' expression was implicitly cast from 'int' type to 'float' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. cpp-tests physicstest.cpp 307


static inline float frand(void)
{
  return rand()/RAND_MAX;
}

This function was discovered among the source files referring to tests. The programmer most likely wanted real numbers to be returned within the range 0.0f - 1.0f, but the rand() function's return value is an integer number, which means its real component is truncated after division. So the function returns only 0.0 or 1.0. Moreover, since the rand() function returns a value between 0 and RAND_MAX, getting number 1.0 is almost improbable.


Miranda NG

V636 The 'alphafactor / 100' expression was implicitly casted from 'int' type to 'float' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. TabSRMM themes.cpp 1753


void CSkin::setupAeroSkins()
{
  ....
  BYTE alphafactor = 255 - ((m_dwmColor & 0xff000000) >> 24);
  ....
  fr *= (alphafactor / 100 * 2.2);
  ....
}

Similar errors can be found in some other places:

  • V636 The 'alphafactor / 100' expression was implicitly casted from 'int' type to 'float' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. TabSRMM themes.cpp 1758
  • V636 The 'alphafactor / 100' expression was implicitly casted from 'int' type to 'float' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. TabSRMM themes.cpp 1763
  • V636 The 'pProbe->aiRowEst[0] / 2' expression was implicitly casted from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. Spamotron sqlite3.c 82859

Open X-Ray Engine

V636 The '1 / 100' expression was implicitly cast from 'int' type to 'float' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. gl_rendertarget.cpp 245


float CRenderTarget::im_noise_time;

CRenderTarget::CRenderTarget()
{
  ....
  param_blur           = 0.f;
  param_gray           = 0.f;
  param_noise          = 0.f;
  param_duality_h      = 0.f;
  param_duality_v      = 0.f;
  param_noise_fps      = 25.f;
  param_noise_scale    = 1.f;

  im_noise_time        = 1/100;
  im_noise_shift_w     = 0;
  im_noise_shift_h     = 0;
  ....
}

ICQ

V636 The expression was implicitly cast from 'int' type to 'float' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. gui backgroundwidget.cpp 28


class QSize
{
  ....
  inline int width() const;
  inline int height() const;
  ....
};

void BackgroundWidget::paintEvent(QPaintEvent *_e)
{
  ....
  QSize pixmapSize = pixmapToDraw_.size();
  float yOffset =
    -(pixmapSize.height() - currentSize_.height()) / 2;
  float xOffset =
    -(pixmapSize.width() - currentSize_.width()) / 2;
  ....
}

Similar errors can be found in some other places:

  • V636 The expression was implicitly cast from 'int' type to 'float' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. gui backgroundwidget.cpp 29
  • V636 The '- (height - currentSize_.height()) / 2' expression was implicitly cast from 'int' type to 'float' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. gui backgroundwidget.cpp 42
  • V636 The '- (width - currentSize_.width()) / 2' expression was implicitly cast from 'int' type to 'float' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. gui backgroundwidget.cpp 49

EFL Core Libraries

V636 The '(tv->tv_usec - now.tv_usec) / 1000' expression was implicitly cast from 'long' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. ecore_audio_pulse_ml.c 175


pa_time_event *
_ecore_pa_time_new(...., const struct timeval *tv, ....)
{
  pa_time_event *event;
  struct timeval now;
  double interval;
  ....
  interval = (tv->tv_sec - now.tv_sec) +
             (tv->tv_usec - now.tv_usec) / 1000;
  ....
}

Similar errors can be found in some other places:

  • V636 The 'edev->output->current_mode->width / 2' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. ecore_drm_evdev.c 83
  • V636 The 'edev->output->current_mode->height / 2' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. ecore_drm_evdev.c 84
  • V636 The 'cluster_adv / items' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. evas_font_query.c 758
  • And 4 additional diagnostic messages.

Tizen

V636 The '_t1.tv_sec * 1000000' expression was implicitly cast from 'long' type to 'float' type. Consider utilizing an explicit type cast to avoid overflow. An example: double A = (double)(X) * Y;. scim_utility.cpp 1492


__extension__ typedef long int __time_t;
__extension__ typedef long int __suseconds_t;

struct timeval
{
  __time_t tv_sec;
  __suseconds_t tv_usec;
};

static struct timeval _t0 = {0, 0};
static struct timeval _t1;

void ISF_PROF_DEBUG_TIME (....)
{
  ....
  etime = ((_t1.tv_sec * 1000000 + _t1.tv_usec) -
           (_t0.tv_sec * 1000000 + _t0.tv_usec))/1000000.0;
  ....
}

Similar errors can be found in some other places:

  • V636 The 'duration / 1000' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. e_devicemgr_device.c 648
  • V636 The 'w / 2' expression was implicitly cast from 'int' type to 'float' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. poly_shape_hit_test.cpp 97
  • V636 The 'w / 2' expression was implicitly cast from 'int' type to 'float' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. poly_shape_hit_test.cpp 98

Minetest

V636 The 'rect.getHeight() / 16' expression was implicitly cast from 'int' type to 'float' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. hud.cpp 771


void drawItemStack(....)
{
  float barheight = rect.getHeight() / 16;
  float barpad_x = rect.getWidth() / 16;
  float barpad_y = rect.getHeight() / 16;

  core::rect<s32> progressrect(
    rect.UpperLeftCorner.X + barpad_x,
    rect.LowerRightCorner.Y - barpad_y - barheight,
    rect.LowerRightCorner.X - barpad_x,
    rect.LowerRightCorner.Y - barpad_y);
}

GTK

V636 [CWE-682] The 'width / 2' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. gtkcellrendererspinner.c 412


static void
gtk_paint_spinner (GtkStyleContext *context,
                   cairo_t         *cr,
                   guint            step,
                   int              x,
                   int              y,
                   int              width,
                   int              height)
{
  GdkRGBA color;
  guint num_steps;
  double dx, dy;
  ....
  dx = width / 2;
  dy = height / 2;
  ....
  cairo_move_to (cr,
                 dx + (radius - inset) * cos (i * G_PI / half),
                 dy + (radius - inset) * sin (i * G_PI / half));
  cairo_line_to (cr,
                 dx + radius * cos (i * G_PI / half),
                 dy + radius * sin (i * G_PI / half));
  ....
}

Similar errors can be found in some other places:

  • V636 [CWE-682] The 'height / 2' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. gtkcellrendererspinner.c 413
  • V636 [CWE-682] The 'width / 2' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. gtkswitch.c 255
  • V636 [CWE-682] The 'width / 2' expression was implicitly cast from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. gtkswitch.c 257