diff --git a/PowerEditor/src/DarkMode/DarkMode.cpp b/PowerEditor/src/DarkMode/DarkMode.cpp
index a6de389fe..ae39218a8 100644
--- a/PowerEditor/src/DarkMode/DarkMode.cpp
+++ b/PowerEditor/src/DarkMode/DarkMode.cpp
@@ -125,9 +125,10 @@ bool AllowDarkModeForWindow(HWND hWnd, bool allow)
 
 bool IsHighContrast()
 {
-	HIGHCONTRASTW highContrast = { sizeof(highContrast) };
-	if (SystemParametersInfoW(SPI_GETHIGHCONTRAST, sizeof(highContrast), &highContrast, FALSE))
-		return highContrast.dwFlags & HCF_HIGHCONTRASTON;
+	HIGHCONTRASTW highContrast{};
+	highContrast.cbSize = sizeof(HIGHCONTRASTW);
+	if (SystemParametersInfoW(SPI_GETHIGHCONTRAST, sizeof(HIGHCONTRASTW), &highContrast, FALSE))
+		return (highContrast.dwFlags & HCF_HIGHCONTRASTON) == HCF_HIGHCONTRASTON;
 	return false;
 }
 
diff --git a/PowerEditor/src/MISC/Common/Common.cpp b/PowerEditor/src/MISC/Common/Common.cpp
index 219db92d1..a1c42c07c 100644
--- a/PowerEditor/src/MISC/Common/Common.cpp
+++ b/PowerEditor/src/MISC/Common/Common.cpp
@@ -785,7 +785,7 @@ bool str2numberVector(generic_string str2convert, std::vector<size_t>& numVect)
 	}
 
 	std::vector<generic_string> v = stringSplit(str2convert, TEXT(" "));
-	for (auto i : v)
+	for (const auto& i : v)
 	{
 		// Don't treat empty string and the number greater than 9999
 		if (!i.empty() && i.length() < 5)
@@ -827,7 +827,7 @@ generic_string stringTakeWhileAdmissable(const generic_string& input, const gene
 }
 
 
-double stodLocale(const generic_string& str, _locale_t loc, size_t* idx)
+double stodLocale(const generic_string& str, [[maybe_unused]] _locale_t loc, size_t* idx)
 {
 	// Copied from the std::stod implementation but uses _wcstod_l instead of wcstod.
 	const wchar_t* ptr = str.c_str();
@@ -1690,7 +1690,7 @@ void Version::setVersionFrom(const generic_string& filePath)
 			return;
 
 		unsigned char* buffer = new unsigned char[bufferSize];
-		::GetFileVersionInfo(filePath.c_str(), uselessArg, bufferSize, buffer);
+		::GetFileVersionInfo(filePath.c_str(), 0, bufferSize, buffer);
 
 		VS_FIXEDFILEINFO* lpFileInfo = nullptr;
 		UINT cbFileInfo = 0;
diff --git a/PowerEditor/src/Parameters.cpp b/PowerEditor/src/Parameters.cpp
index 5ae53793b..76b17cddc 100644
--- a/PowerEditor/src/Parameters.cpp
+++ b/PowerEditor/src/Parameters.cpp
@@ -1803,8 +1803,9 @@ bool NppParameters::isInFontList(const generic_string& fontName2Search) const
 HFONT NppParameters::getDefaultUIFont()
 {
 	static HFONT g_defaultMessageFont = []() {
-		NONCLIENTMETRICS ncm = { sizeof(ncm) };
-		SystemParametersInfo(SPI_GETNONCLIENTMETRICS, sizeof(ncm), &ncm, 0);
+		NONCLIENTMETRICS ncm{};
+		ncm.cbSize = sizeof(NONCLIENTMETRICS);
+		SystemParametersInfo(SPI_GETNONCLIENTMETRICS, sizeof(NONCLIENTMETRICS), &ncm, 0);
 
 		return CreateFontIndirect(&ncm.lfMessageFont);
 	}();
@@ -3280,7 +3281,7 @@ void NppParameters::writeDefaultUDL()
 {
 	bool firstCleanDone = false;
 	std::vector<bool> deleteState;
-	for (auto udl : _pXmlUserLangsDoc)
+	for (const auto& udl : _pXmlUserLangsDoc)
 	{
 		if (!_pXmlUserLangDoc)
 		{
@@ -3337,7 +3338,7 @@ void NppParameters::writeDefaultUDL()
 
 void NppParameters::writeNonDefaultUDL()
 {
-	for (auto udl : _pXmlUserLangsDoc)
+	for (auto& udl : _pXmlUserLangsDoc)
 	{
 		if (udl._isDirty && udl._udlXmlDoc != nullptr && udl._udlXmlDoc != _pXmlUserLangDoc)
 		{
diff --git a/PowerEditor/src/ScintillaComponent/FindReplaceDlg.cpp b/PowerEditor/src/ScintillaComponent/FindReplaceDlg.cpp
index b7c6cbb77..ef1fd7fea 100644
--- a/PowerEditor/src/ScintillaComponent/FindReplaceDlg.cpp
+++ b/PowerEditor/src/ScintillaComponent/FindReplaceDlg.cpp
@@ -1256,7 +1256,8 @@ intptr_t CALLBACK FindReplaceDlg::run_dlgProc(UINT message, WPARAM wParam, LPARA
 			HWND hDirCombo = ::GetDlgItem(_hSelf, IDD_FINDINFILES_DIR_COMBO);
 
 			// Change handler of edit element in the comboboxes to support Ctrl+Backspace
-			COMBOBOXINFO cbinfo = { sizeof(COMBOBOXINFO) };
+			COMBOBOXINFO cbinfo{};
+			cbinfo.cbSize = sizeof(COMBOBOXINFO);
 			GetComboBoxInfo(hFindCombo, &cbinfo);
 			if (!cbinfo.hwndItem) return FALSE;
 
@@ -1689,7 +1690,7 @@ intptr_t CALLBACK FindReplaceDlg::run_dlgProc(UINT message, WPARAM wParam, LPARA
 				{
 					setStatusbarMessage(TEXT(""), FSNoMessage);
 					const int filterSize = 512;
-					TCHAR filters[filterSize + 1];
+					TCHAR filters[filterSize + 1] = { '\0' };
 					filters[filterSize] = '\0';
 					TCHAR directory[MAX_PATH];
 					::GetDlgItemText(_hSelf, IDD_FINDINFILES_FILTERS_COMBO, filters, filterSize);
@@ -5494,8 +5495,8 @@ int Progress::createProgressWindow()
 	int height = cPBheight + cBTNheight + textHeight + progressBarPadding + morePadding;
 
 
-	POINT center;
-	RECT callerRect;
+	POINT center{};
+	RECT callerRect{};
 	::GetWindowRect(_hCallerWnd, &callerRect);
 	center.x = (callerRect.left + callerRect.right) / 2;
 	center.y = (callerRect.top + callerRect.bottom) / 2;
diff --git a/PowerEditor/src/ScintillaComponent/UserDefineDialog.cpp b/PowerEditor/src/ScintillaComponent/UserDefineDialog.cpp
index 06994f46d..d2a583a82 100644
--- a/PowerEditor/src/ScintillaComponent/UserDefineDialog.cpp
+++ b/PowerEditor/src/ScintillaComponent/UserDefineDialog.cpp
@@ -1017,15 +1017,15 @@ intptr_t CALLBACK UserDefineDialog::run_dlgProc(UINT message, WPARAM wParam, LPA
             _ctrlTab.createTabs(_wVector);
             _ctrlTab.display();
 
-            RECT arc;
+            RECT arc{};
             ::GetWindowRect(::GetDlgItem(_hSelf, IDC_IMPORT_BUTTON), &arc);
 
-            POINT p;
+            POINT p{};
             p.x = arc.left;
             p.y = arc.bottom;
             ::ScreenToClient(_hSelf, &p);
 
-            RECT rc;
+            RECT rc{};
             getClientRect(rc);
             rc.top = p.y + 10;
             rc.bottom -= 20;
@@ -1051,14 +1051,14 @@ intptr_t CALLBACK UserDefineDialog::run_dlgProc(UINT message, WPARAM wParam, LPA
                 if (!(BST_CHECKED == ::SendDlgItemMessage(_hSelf, IDC_UD_PERCENTAGE_SLIDER, BM_GETCHECK, 0, 0)))
                     ::EnableWindow(::GetDlgItem(_hSelf, IDC_UD_PERCENTAGE_SLIDER), FALSE);
             }
-            SCROLLINFO si;
+            SCROLLINFO si{};
             si.cbSize = sizeof(si);
             si.fMask  = SIF_RANGE; //| SIF_PAGE;
             si.nMin   = 0;
             si.nMax   = 0;
             ::SetScrollInfo(_hSelf, SB_VERT, &si, TRUE);
 
-            TCHAR temp[32];
+            TCHAR temp[32] = { '\0' };
             generic_string udlVersion = TEXT("User Defined Language v.");
             udlVersion += _itow(SCE_UDL_VERSION_MAJOR, temp, 10);
             udlVersion += TEXT(".");
@@ -1221,7 +1221,7 @@ intptr_t CALLBACK UserDefineDialog::run_dlgProc(UINT message, WPARAM wParam, LPA
                         {
                             auto i = ::SendDlgItemMessage(_hSelf, IDC_LANGNAME_COMBO, CB_GETCURSEL, 0, 0);
 							const size_t langNameLen = 256;
-							TCHAR langName[langNameLen + 1];
+							TCHAR langName[langNameLen + 1] = { '\0' };
 							auto cbTextLen = ::SendDlgItemMessage(_hSelf, IDC_LANGNAME_COMBO, CB_GETLBTEXTLEN, i, 0);
 							if (static_cast<size_t>(cbTextLen) > langNameLen)
 								return TRUE;
@@ -1250,7 +1250,7 @@ intptr_t CALLBACK UserDefineDialog::run_dlgProc(UINT message, WPARAM wParam, LPA
                     {
                         auto i = ::SendDlgItemMessage(_hSelf, IDC_LANGNAME_COMBO, CB_GETCURSEL, 0, 0);
 						const size_t langNameLen = 256;
-						TCHAR langName[langNameLen + 1];
+						TCHAR langName[langNameLen + 1] = { '\0' };
 						auto cbTextLen = ::SendDlgItemMessage(_hSelf, IDC_LANGNAME_COMBO, CB_GETLBTEXTLEN, i, 0);
 						if (static_cast<size_t>(cbTextLen) > langNameLen)
 							return TRUE;
@@ -1454,7 +1454,7 @@ intptr_t CALLBACK UserDefineDialog::run_dlgProc(UINT message, WPARAM wParam, LPA
 
              int maxPos = originalHight - _currentHight;
             // Set the vertical scrolling range and page size
-            SCROLLINFO si;
+            SCROLLINFO si{};
             si.cbSize = sizeof(si);
             si.fMask  = SIF_RANGE | SIF_PAGE;
             si.nMin   = 0;
@@ -1618,8 +1618,7 @@ intptr_t CALLBACK StringDlg::run_dlgProc(UINT Message, WPARAM wParam, LPARAM)
             {
                 case IDOK :
                 {
-                    TCHAR tmpName[langNameLenMax];
-                    tmpName[0] = '\0';
+                    TCHAR tmpName[langNameLenMax] = { '\0' };
                     ::GetDlgItemText(_hSelf, IDC_STRING_EDIT, tmpName, langNameLenMax);
                     _textValue = tmpName;
                     ::EndDialog(_hSelf, reinterpret_cast<intptr_t>(_textValue.c_str()));
@@ -1684,7 +1683,7 @@ LRESULT StringDlg::customEditProc(HWND hEdit, UINT msg, WPARAM wParam, LPARAM lP
 	return CallWindowProc(pSelf->_oldEditProc, hEdit, msg, wParam, lParam);
 }
 
-bool StringDlg::isAllowed(const generic_string & txt)
+bool StringDlg::isAllowed([[maybe_unused]] const generic_string & txt)
 {
 #ifndef __MINGW32__
 	for (auto ch : txt)
diff --git a/PowerEditor/src/WinControls/DockingWnd/DockingCont.cpp b/PowerEditor/src/WinControls/DockingWnd/DockingCont.cpp
index ddd05b0b9..8da876006 100644
--- a/PowerEditor/src/WinControls/DockingWnd/DockingCont.cpp
+++ b/PowerEditor/src/WinControls/DockingWnd/DockingCont.cpp
@@ -376,7 +376,7 @@ LRESULT DockingCont::runProcCaption(HWND hwnd, UINT Message, WPARAM wParam, LPAR
 
 				if ((_bCaptionTT == TRUE) || (_hoverMPos == posClose))
 				{
-					TRACKMOUSEEVENT tme;
+					TRACKMOUSEEVENT tme{};
 					tme.cbSize = sizeof(tme);
 					tme.hwndTrack = hwnd;
 					tme.dwFlags = TME_LEAVE | TME_HOVER;
@@ -717,7 +717,15 @@ LRESULT DockingCont::runProcTab(HWND hwnd, UINT Message, WPARAM wParam, LPARAM l
 			int nSelTab = TabCtrl_GetCurSel(hwnd);
 			for (int i = 0; i < nTabs; ++i)
 			{
-				DRAWITEMSTRUCT dis = { ODT_TAB, id, (UINT)i, ODA_DRAWENTIRE, ODS_DEFAULT, hwnd, hdc };
+				DRAWITEMSTRUCT dis{};
+				dis.CtlType = ODT_TAB;
+				dis.CtlID = id;
+				dis.itemID = static_cast<UINT>(i);
+				dis.itemAction = ODA_DRAWENTIRE;
+				dis.itemState = ODS_DEFAULT;
+				dis.hwndItem = hwnd;
+				dis.hDC = hdc;
+
 				TabCtrl_GetItemRect(hwnd, i, &dis.rcItem);
 
 				if (i == nFocusTab)
@@ -857,7 +865,7 @@ LRESULT DockingCont::runProcTab(HWND hwnd, UINT Message, WPARAM wParam, LPARAM l
 
 				if ((_bTabTTHover == FALSE) && (iItem != iItemSel))
 				{
-					TRACKMOUSEEVENT tme;
+					TRACKMOUSEEVENT tme{};
 					tme.cbSize = sizeof(tme);
 					tme.hwndTrack = hwnd;
 					tme.dwFlags = TME_LEAVE | TME_HOVER;
@@ -1324,7 +1332,7 @@ void DockingCont::onSize()
 							SWP_NOZORDER);
 
 			// Notify switch in
-			NMHDR nmhdr;
+			NMHDR nmhdr{};
 			nmhdr.code		= DMN_FLOATDROPPED;
 			nmhdr.hwndFrom	= _hSelf;
 			nmhdr.idFrom	= 0;
@@ -1543,7 +1551,7 @@ void DockingCont::selectTab(int iTab)
 		::SetFocus(((tTbData*)tcItem.lParam)->hClient);
 
 		// Notify switch in
-		NMHDR nmhdr;
+		NMHDR nmhdr{};
 		nmhdr.code		= DMN_SWITCHIN;
 		nmhdr.hwndFrom	= _hSelf;
 		nmhdr.idFrom	= 0;
@@ -1559,7 +1567,7 @@ void DockingCont::selectTab(int iTab)
 			::ShowWindow(((tTbData*)tcItem.lParam)->hClient, SW_HIDE);
 		
 			// Notify switch off
-			NMHDR nmhdr;
+			NMHDR nmhdr{};
 			nmhdr.code		= DMN_SWITCHOFF;
 			nmhdr.hwndFrom	= _hSelf;
 			nmhdr.idFrom	= 0;
diff --git a/PowerEditor/src/WinControls/FunctionList/functionParser.cpp b/PowerEditor/src/WinControls/FunctionList/functionParser.cpp
index 078ddeb4d..806a2dd36 100644
--- a/PowerEditor/src/WinControls/FunctionList/functionParser.cpp
+++ b/PowerEditor/src/WinControls/FunctionList/functionParser.cpp
@@ -564,7 +564,7 @@ size_t FunctionZoneParser::getBodyClosePos(size_t begin, const TCHAR *bodyOpenSy
 	return targetEnd;
 }
 
-void FunctionZoneParser::classParse(vector<foundInfo> & foundInfos, vector< pair<size_t, size_t> > &scannedZones, const std::vector< std::pair<size_t, size_t> > & commentZones, size_t begin, size_t end, ScintillaEditView **ppEditView, generic_string classStructName)
+void FunctionZoneParser::classParse(vector<foundInfo> & foundInfos, vector< pair<size_t, size_t> > &scannedZones, const std::vector< std::pair<size_t, size_t> > & commentZones, size_t begin, size_t end, ScintillaEditView **ppEditView, generic_string /*classStructName*/)
 {
 	if (begin >= end)
 		return;
@@ -582,7 +582,7 @@ void FunctionZoneParser::classParse(vector<foundInfo> & foundInfos, vector< pair
 
 		// Get class name
 		intptr_t foundPos = 0;
-		generic_string classStructName = parseSubLevel(targetStart, targetEnd, _classNameExprArray, foundPos, ppEditView);
+		generic_string subLevelClassStructName = parseSubLevel(targetStart, targetEnd, _classNameExprArray, foundPos, ppEditView);
 		
 
 		if (!_openSymbole.empty() && !_closeSymbole.empty())
@@ -603,7 +603,7 @@ void FunctionZoneParser::classParse(vector<foundInfo> & foundInfos, vector< pair
 		//vector< generic_string > emptyArray;
 		if (!isInZones(targetStart, commentZones))
 		{
-			funcParse(foundInfos, targetStart, targetEnd, ppEditView, classStructName, &commentZones);
+			funcParse(foundInfos, targetStart, targetEnd, ppEditView, subLevelClassStructName, &commentZones);
 		}
 		begin = targetStart + (targetEnd - targetStart);
 		targetStart = (*ppEditView)->searchInTarget(_rangeExpr.c_str(), _rangeExpr.length(), begin, end);
diff --git a/PowerEditor/src/uchardet/CharDistribution.cpp b/PowerEditor/src/uchardet/CharDistribution.cpp
index 2ccda334a..c04eba8ee 100644
--- a/PowerEditor/src/uchardet/CharDistribution.cpp
+++ b/PowerEditor/src/uchardet/CharDistribution.cpp
@@ -57,7 +57,7 @@ float CharDistributionAnalysis::GetConfidence(void)
 
   if (mTotalChars != mFreqChars)
   {
-    float r = mFreqChars / ((mTotalChars - mFreqChars) * mTypicalDistributionRatio);
+    float r = static_cast<float>(mFreqChars) / (static_cast<float>(mTotalChars - mFreqChars) * mTypicalDistributionRatio);
 
     if (r < SURE_YES)
       return r;
diff --git a/PowerEditor/src/uchardet/JpCntx.cpp b/PowerEditor/src/uchardet/JpCntx.cpp
index d6a437381..a0c98edc2 100644
--- a/PowerEditor/src/uchardet/JpCntx.cpp
+++ b/PowerEditor/src/uchardet/JpCntx.cpp
@@ -186,7 +186,7 @@ float  JapaneseContextAnalysis::GetConfidence(void)
 {
   //This is just one way to calculate confidence. It works well for me.
   if (mTotalRel > mDataThreshold)
-    return ((float)(mTotalRel - mRelSample[0]))/mTotalRel;
+    return static_cast<float>(mTotalRel - mRelSample[0]) / static_cast<float>(mTotalRel);
   else 
     return (float)DONT_KNOW;
 }
diff --git a/PowerEditor/src/uchardet/nsLatin1Prober.cpp b/PowerEditor/src/uchardet/nsLatin1Prober.cpp
index 7ef2a1e74..642b18e49 100644
--- a/PowerEditor/src/uchardet/nsLatin1Prober.cpp
+++ b/PowerEditor/src/uchardet/nsLatin1Prober.cpp
@@ -158,8 +158,9 @@ float nsLatin1Prober::GetConfidence(void)
     confidence = 0.0f;
   else
   {
-    confidence = mFreqCounter[3]*1.0f / total;
-    confidence -= mFreqCounter[1]*20.0f/total;
+    const float floatTotal = static_cast<float>(total);
+    confidence = static_cast<float>(mFreqCounter[3]) / floatTotal;
+    confidence -= static_cast<float>(mFreqCounter[1]) * 20.0f / floatTotal;
   }
 
   if (confidence < 0.0f)
diff --git a/PowerEditor/src/uchardet/nsPkgInt.h b/PowerEditor/src/uchardet/nsPkgInt.h
index b1e66785e..72bcaa564 100644
--- a/PowerEditor/src/uchardet/nsPkgInt.h
+++ b/PowerEditor/src/uchardet/nsPkgInt.h
@@ -72,6 +72,7 @@ struct nsPkgInt {
   nsPkgInt(nsIdxSft a,nsSftMsk b, nsBitSft c,nsUnitMsk d,const PRUint32* const  e)
 	  :idxsft(a), sftmsk(b), bitsft(c), unitmsk(d), data(e){}
   nsPkgInt();
+  nsPkgInt(const nsPkgInt&) = default;
   nsPkgInt operator= (const nsPkgInt&);
 };
 
diff --git a/PowerEditor/src/uchardet/nsSBCharSetProber.cpp b/PowerEditor/src/uchardet/nsSBCharSetProber.cpp
index 3a88fdf31..8e17a0bcb 100644
--- a/PowerEditor/src/uchardet/nsSBCharSetProber.cpp
+++ b/PowerEditor/src/uchardet/nsSBCharSetProber.cpp
@@ -102,8 +102,8 @@ float nsSingleByteCharSetProber::GetConfidence(void)
   float r;
 
   if (mTotalSeqs > 0) {
-    r = ((float)1.0) * mSeqCounters[POSITIVE_CAT] / mTotalSeqs / mModel->mTypicalPositiveRatio;
-    r = r*mFreqChar/mTotalChar;
+    r = static_cast<float>(mSeqCounters[POSITIVE_CAT]) / static_cast<float>(mTotalSeqs) / mModel->mTypicalPositiveRatio;
+    r = r * static_cast<float>(mFreqChar) / static_cast<float>(mTotalChar);
     if (r >= (float)1.00)
       r = (float)0.99;
     return r;