diff --git a/ext2sim/ext2sim.c b/ext2sim/ext2sim.c
index 51861ec4..68248401 100644
--- a/ext2sim/ext2sim.c
+++ b/ext2sim/ext2sim.c
@@ -1338,8 +1338,8 @@ FILE *outf;
     suf = EFHNToStr(suffix);
     if (fetInfo[type].defSubs && strcasecmp(suf,fetInfo[type].defSubs) == 0) {
     	l = strlen(suf) - 1;
-	if (  ( EFOutputFlags & EF_TRIMGLOB ) && suf[l] =='!' ||
-	      ( EFOutputFlags & EF_TRIMLOCAL ) && suf[l] == '#'  )
+	if (  (( EFOutputFlags & EF_TRIMGLOB ) && suf[l] =='!') ||
+	      (( EFOutputFlags & EF_TRIMLOCAL ) && suf[l] == '#')  )
 	      suf[l] = '\0' ;
 	if ( esFormat == SU )
 		fprintf(outf, "S_");
diff --git a/ext2spice/ext2hier.c b/ext2spice/ext2hier.c
index 543d3dbf..42d6786d 100644
--- a/ext2spice/ext2hier.c
+++ b/ext2spice/ext2hier.c
@@ -1409,7 +1409,7 @@ spcnodeHierVisit(hc, node, res, cap)
     hierName = (HierName *) node->efnode_name->efnn_hier;
     nsn = nodeSpiceHierName(hc, hierName);
 
-    if (esFormat == SPICE2 || esFormat == HSPICE && !strncmp(nsn, "z@", 2)) {
+    if (esFormat == SPICE2 || (esFormat == HSPICE && !strncmp(nsn, "z@", 2))) {
 	static char ntmp[MAX_STR_SIZE];
 
 	EFHNSprintf(ntmp, hierName);
diff --git a/ext2spice/ext2spice.c b/ext2spice/ext2spice.c
index 45cc93be..d9d56954 100644
--- a/ext2spice/ext2spice.c
+++ b/ext2spice/ext2spice.c
@@ -169,8 +169,8 @@ esFormatSubs(outf, suf)
     if (outf)
     {
 	l = strlen(suf) - 1;
-	if ((EFOutputFlags & EF_TRIMGLOB ) && suf[l] == '!' ||
-	         (EFOutputFlags & EF_TRIMLOCAL) && suf[l] == '#')
+	if (((EFOutputFlags & EF_TRIMGLOB ) && suf[l] == '!') ||
+	         ((EFOutputFlags & EF_TRIMLOCAL) && suf[l] == '#'))
 	    suf[l] = '\0' ;
 	if (EFOutputFlags & EF_CONVERTCOMMA)
 	    while ((specchar = strchr(suf, ',')) != NULL)
@@ -3652,7 +3652,7 @@ spcnodeVisit(node, res, cap)
     hierName = (HierName *) node->efnode_name->efnn_hier;
     nsn = nodeSpiceName(hierName, NULL);
 
-    if (esFormat == SPICE2 || esFormat == HSPICE && strncmp(nsn, "z@", 2)==0 ) {
+    if (esFormat == SPICE2 || (esFormat == HSPICE && strncmp(nsn, "z@", 2)==0 )) {
 	static char ntmp[MAX_STR_SIZE];
 
 	EFHNSprintf(ntmp, hierName);
diff --git a/gcr/gcrDebug.c b/gcr/gcrDebug.c
index de233897..146b2ff9 100644
--- a/gcr/gcrDebug.c
+++ b/gcr/gcrDebug.c
@@ -635,7 +635,7 @@ void  gcrPrintCol(ch, i, showResult)
 		    }
 		    else TxPrintf("#");
 		}
-		else if ((res[i][j] & GCRU) || j != 0 && (res[i][j-1] & GCRU))
+		else if ((res[i][j] & GCRU) || (j != 0 && (res[i][j-1] & GCRU)))
 		{
 		    if((res[i][j]&GCRCC) && (!(res[i][j]&(GCRBLKM|GCRBLKP))))
 		    {
diff --git a/resis/ResMakeRes.c b/resis/ResMakeRes.c
index 4feeeb07..5a5ff1ad 100644
--- a/resis/ResMakeRes.c
+++ b/resis/ResMakeRes.c
@@ -667,11 +667,11 @@ ResCalcNearDevice(tile, pendingList, doneList, resList)
 	/* 2. There are devices along two sides at right angles,    */
 	/*    and the tile is wider than it is tall.		    */
 
-	if ((devedge & TOPEDGE) && (devedge & BOTTOMEDGE) &&
-	      !(devedge & LEFTEDGE) && !(devedge & RIGHTEDGE) ||
-	      (devedge & TOPEDGE || devedge & BOTTOMEDGE) &&
+	if (((devedge & TOPEDGE) && (devedge & BOTTOMEDGE) &&
+	      !(devedge & LEFTEDGE) && !(devedge & RIGHTEDGE)) ||
+	      ((devedge & TOPEDGE || devedge & BOTTOMEDGE) &&
 	      (devedge & LEFTEDGE || devedge & RIGHTEDGE) &&
-	      (RIGHT(tile) - LEFT(tile)) > (TOP(tile) - BOTTOM(tile)))
+	      (RIGHT(tile) - LEFT(tile)) > (TOP(tile) - BOTTOM(tile))))
 	{
             /* re-sort nodes south to north. */
 	    ResSortBreaks(&junk->breakList, FALSE);
@@ -939,8 +939,8 @@ ResSortBreaks(masterlist, xsort)
 	p3 = p2->br_next;
 	while (p3 != NULL)
 	{
-	    if (xsort == TRUE  && p2->br_loc.p_x > p3->br_loc.p_x ||
-	           xsort == FALSE && p2->br_loc.p_y > p3->br_loc.p_y)
+	    if ((xsort == TRUE  && p2->br_loc.p_x > p3->br_loc.p_x) ||
+	           (xsort == FALSE && p2->br_loc.p_y > p3->br_loc.p_y))
 	    {
 		changed = TRUE;
 		if (p1 == NULL)
diff --git a/resis/ResRex.c b/resis/ResRex.c
index a2fe3a97..3c5749eb 100644
--- a/resis/ResRex.c
+++ b/resis/ResRex.c
@@ -1033,9 +1033,9 @@ ResCheckSimNodes(celldef, resisdata)
      	ResFHFile = NULL;
     }
 
-    if (ResExtFile == NULL && (ResOptionsFlags & ResOpt_DoExtFile)
-         || (ResOptionsFlags & ResOpt_DoLumpFile) && ResLumpFile == NULL
-         || (ResOptionsFlags & ResOpt_FastHenry) && ResFHFile == NULL)
+    if ((ResExtFile == NULL && (ResOptionsFlags & ResOpt_DoExtFile))
+         || ((ResOptionsFlags & ResOpt_DoLumpFile) && ResLumpFile == NULL)
+         || ((ResOptionsFlags & ResOpt_FastHenry) && ResFHFile == NULL))
     {
      	TxError("Couldn't open output file\n");
 	return;
diff --git a/resis/ResSimple.c b/resis/ResSimple.c
index b0f7aae9..3e87d673 100644
--- a/resis/ResSimple.c
+++ b/resis/ResSimple.c
@@ -198,8 +198,8 @@ ResSimplifyNet(nodelist, biglist, reslist, tolerance)
 	     * Break loop here. More than one driver indicates a loop;
 	     * remove deadend, allowing drivers to be merged
 	     */
-	    else if (UnMarkedReceivers == 0 && (MarkedReceivers == 1 &&
-		    NumberOfDrivers > 1 || resistor2 != resistor1))
+	    else if (UnMarkedReceivers == 0 && ((MarkedReceivers == 1 &&
+		    NumberOfDrivers > 1) || resistor2 != resistor1))
 
 	    {
 		otherNode->rn_float.rn_area += resistor1->rr_float.rr_area;
diff --git a/select/selEnum.c b/select/selEnum.c
index b59b0964..8cb6e7ec 100644
--- a/select/selEnum.c
+++ b/select/selEnum.c
@@ -320,8 +320,8 @@ selEnumPFunc2(tile, arg)
     /* Also okay if the X over Y yields a stacking type whose residues	*/
     /* are X and Y.							*/
 
-    if ((ttype != seltype) && (((ttype == TT_SPACE) &&
-		TTMaskHasType(&DBHomePlaneTypes[arg->sea_plane], seltype))) ||
+    if (((ttype != seltype) && (((ttype == TT_SPACE) &&
+		TTMaskHasType(&DBHomePlaneTypes[arg->sea_plane], seltype)))) ||
 		(DBPaintResultTbl[arg->sea_plane][ttype][seltype] != seltype))
     {
 	TileType chktype = DBPaintResultTbl[arg->sea_plane][ttype][seltype];