Added braces to expressions.

13 files changed, 119 insertions, 115 deletions

diff --git a/library/demos/arrow.tcl b/library/demos/arrow.tcl
index 78befc3..5d37233 100644
--- a/library/demos/arrow.tcl
+++ b/library/demos/arrow.tcl
@@ -3,7 +3,7 @@
 # This demonstration script creates a canvas widget that displays a
 # large line with an arrowhead whose shape can be edited interactively.
 #
-# RCS: @(#) $Id: arrow.tcl,v 1.2 1998/09/14 18:23:26 stanton Exp $
+# RCS: @(#) $Id: arrow.tcl,v 1.3 2001/06/14 10:56:58 dkf Exp $
 
 if {![info exists widgetDemo]} {
     error "This script should be run from the \"widget\" demo."
@@ -33,68 +33,69 @@ proc arrowSetup c {
     # Create the arrow and outline.
 
     $c delete all
-    eval "$c create line $v(x1) $v(y) $v(x2) $v(y) -width [expr 10*$v(width)] \
-	    -arrowshape {[expr 10*$v(a)] [expr 10*$v(b)] [expr 10*$v(c)]} \
-	    -arrow last $v(bigLineStyle)"
-    set xtip [expr $v(x2)-10*$v(b)]
-    set deltaY [expr 10*$v(c)+5*$v(width)]
-    $c create line $v(x2) $v(y) $xtip [expr $v(y)+$deltaY] \
-	    [expr $v(x2)-10*$v(a)] $v(y) $xtip [expr $v(y)-$deltaY] \
+    eval {$c create line $v(x1) $v(y) $v(x2) $v(y)  -arrow last \
+	    -width [expr {10*$v(width)}] -arrowshape [list \
+	    [expr {10*$v(a)}] [expr {10*$v(b)}] [expr {10*$v(c)}]]} \
+	    $v(bigLineStyle)
+    set xtip [expr {$v(x2)-10*$v(b)}]
+    set deltaY [expr {10*$v(c)+5*$v(width)}]
+    $c create line $v(x2) $v(y) $xtip [expr {$v(y)+$deltaY}] \
+	    [expr {$v(x2)-10*$v(a)}] $v(y) $xtip [expr {$v(y)-$deltaY}] \
 	    $v(x2) $v(y) -width 2 -capstyle round -joinstyle round
 
     # Create the boxes for reshaping the line and arrowhead.
 
-    eval "$c create rect [expr $v(x2)-10*$v(a)-5] [expr $v(y)-5] \
-	    [expr $v(x2)-10*$v(a)+5] [expr $v(y)+5] $v(boxStyle) \
-	    -tags {box1 box}"
-    eval "$c create rect [expr $xtip-5] [expr $v(y)-$deltaY-5] \
-	    [expr $xtip+5] [expr $v(y)-$deltaY+5] $v(boxStyle) \
-	    -tags {box2 box}"
-    eval "$c create rect [expr $v(x1)-5] [expr $v(y)-5*$v(width)-5] \
-	    [expr $v(x1)+5] [expr $v(y)-5*$v(width)+5] $v(boxStyle) \
-	    -tags {box3 box}"
+    eval {$c create rect [expr {$v(x2)-10*$v(a)-5}] [expr {$v(y)-5}] \
+	    [expr {$v(x2)-10*$v(a)+5}] [expr {$v(y)+5}] \
+	    -tags {box1 box}} $v(boxStyle)
+    eval {$c create rect [expr {$xtip-5}] [expr {$v(y)-$deltaY-5}] \
+	    [expr {$xtip+5}] [expr {$v(y)-$deltaY+5}] \
+	    -tags {box2 box}} $v(boxStyle)
+    eval {$c create rect [expr {$v(x1)-5}] [expr {$v(y)-5*$v(width)-5}] \
+	    [expr {$v(x1)+5}] [expr {$v(y)-5*$v(width)+5}] \
+	    -tags {box3 box}} $v(boxStyle)
     if {$cur != ""} {
 	eval $c itemconfigure $cur $v(activeStyle)
     }
 
     # Create three arrows in actual size with the same parameters
 
-    $c create line [expr $v(x2)+50] 0 [expr $v(x2)+50] 1000 \
+    $c create line [expr {$v(x2)+50}] 0 [expr {$v(x2)+50}] 1000 \
 	    -width 2
-    set tmp [expr $v(x2)+100]
-    $c create line $tmp [expr $v(y)-125] $tmp [expr $v(y)-75] \
+    set tmp [expr {$v(x2)+100}]
+    $c create line $tmp [expr {$v(y)-125}] $tmp [expr {$v(y)-75}] \
 	    -width $v(width) \
 	    -arrow both -arrowshape "$v(a) $v(b) $v(c)"
-    $c create line [expr $tmp-25] $v(y) [expr $tmp+25] $v(y) \
+    $c create line [expr {$tmp-25}] $v(y) [expr {$tmp+25}] $v(y) \
 	    -width $v(width) \
 	    -arrow both -arrowshape "$v(a) $v(b) $v(c)"
-    $c create line [expr $tmp-25] [expr $v(y)+75] [expr $tmp+25] \
-	    [expr $v(y)+125] -width $v(width) \
+    $c create line [expr {$tmp-25}] [expr {$v(y)+75}] [expr {$tmp+25}] \
+	    [expr {$v(y)+125}] -width $v(width) \
 	    -arrow both -arrowshape "$v(a) $v(b) $v(c)"
 
     # Create a bunch of other arrows and text items showing the
     # current dimensions.
 
-    set tmp [expr $v(x2)+10]
-    $c create line $tmp [expr $v(y)-5*$v(width)] \
-	    $tmp [expr $v(y)-$deltaY] \
+    set tmp [expr {$v(x2)+10}]
+    $c create line $tmp [expr {$v(y)-5*$v(width)}] \
+	    $tmp [expr {$v(y)-$deltaY}] \
 	    -arrow both -arrowshape $v(smallTips)
-    $c create text [expr $v(x2)+15] [expr $v(y)-$deltaY+5*$v(c)] \
+    $c create text [expr {$v(x2)+15}] [expr {$v(y)-$deltaY+5*$v(c)}] \
 	    -text $v(c) -anchor w
-    set tmp [expr $v(x1)-10]
-    $c create line $tmp [expr $v(y)-5*$v(width)] \
-	    $tmp [expr $v(y)+5*$v(width)] \
+    set tmp [expr {$v(x1)-10}]
+    $c create line $tmp [expr {$v(y)-5*$v(width)}] \
+	    $tmp [expr {$v(y)+5*$v(width)}] \
 	    -arrow both -arrowshape $v(smallTips)
-    $c create text [expr $v(x1)-15] $v(y) -text $v(width) -anchor e
-    set tmp [expr $v(y)+5*$v(width)+10*$v(c)+10]
-    $c create line [expr $v(x2)-10*$v(a)] $tmp $v(x2) $tmp \
+    $c create text [expr {$v(x1)-15}] $v(y) -text $v(width) -anchor e
+    set tmp [expr {$v(y)+5*$v(width)+10*$v(c)+10}]
+    $c create line [expr {$v(x2)-10*$v(a)}] $tmp $v(x2) $tmp \
 	    -arrow both -arrowshape $v(smallTips)
-    $c create text [expr $v(x2)-5*$v(a)] [expr $tmp+5] \
+    $c create text [expr {$v(x2)-5*$v(a)}] [expr {$tmp+5}] \
 	    -text $v(a) -anchor n
-    set tmp [expr $tmp+25]
-    $c create line [expr $v(x2)-10*$v(b)] $tmp $v(x2) $tmp \
+    set tmp [expr {$tmp+25}]
+    $c create line [expr {$v(x2)-10*$v(b)}] $tmp $v(x2) $tmp \
 	    -arrow both -arrowshape $v(smallTips)
-    $c create text [expr $v(x2)-5*$v(b)] [expr $tmp+5] \
+    $c create text [expr {$v(x2)-5*$v(b)}] [expr {$tmp+5}] \
 	    -text $v(b) -anchor n
 
     $c create text $v(x1) 310 -text "-width  $v(width)" \
@@ -168,7 +169,7 @@ bind $c <Any-ButtonRelease-1> "arrowSetup $c"
 
 proc arrowMove1 {c x y} {
     upvar #0 demo_arrowInfo v
-    set newA [expr ($v(x2)+5-round([$c canvasx $x]))/10]
+    set newA [expr {($v(x2)+5-round([$c canvasx $x]))/10}]
     if {$newA < 0} {
 	set newA 0
     }
@@ -176,7 +177,7 @@ proc arrowMove1 {c x y} {
 	set newA 25
     }
     if {$newA != $v(a)} {
-	$c move box1 [expr 10*($v(a)-$newA)] 0
+	$c move box1 [expr {10*($v(a)-$newA)}] 0
 	set v(a) $newA
     }
 }
@@ -192,14 +193,14 @@ proc arrowMove1 {c x y} {
 
 proc arrowMove2 {c x y} {
     upvar #0 demo_arrowInfo v
-    set newB [expr ($v(x2)+5-round([$c canvasx $x]))/10]
+    set newB [expr {($v(x2)+5-round([$c canvasx $x]))/10}]
     if {$newB < 0} {
 	set newB 0
     }
     if {$newB > 25} {
 	set newB 25
     }
-    set newC [expr ($v(y)+5-round([$c canvasy $y])-5*$v(width))/10]
+    set newC [expr {($v(y)+5-round([$c canvasy $y])-5*$v(width))/10}]
     if {$newC < 0} {
 	set newC 0
     }
@@ -207,7 +208,7 @@ proc arrowMove2 {c x y} {
 	set newC 20
     }
     if {($newB != $v(b)) || ($newC != $v(c))} {
-	$c move box2 [expr 10*($v(b)-$newB)] [expr 10*($v(c)-$newC)]
+	$c move box2 [expr {10*($v(b)-$newB)}] [expr {10*($v(c)-$newC)}]
 	set v(b) $newB
 	set v(c) $newC
     }
@@ -224,7 +225,7 @@ proc arrowMove2 {c x y} {
 
 proc arrowMove3 {c x y} {
     upvar #0 demo_arrowInfo v
-    set newWidth [expr ($v(y)+2-round([$c canvasy $y]))/5]
+    set newWidth [expr {($v(y)+2-round([$c canvasy $y]))/5}]
     if {$newWidth < 0} {
 	set newWidth 0
     }
@@ -232,7 +233,7 @@ proc arrowMove3 {c x y} {
 	set newWidth 20
     }
     if {$newWidth != $v(width)} {
-	$c move box3 0 [expr 5*($v(width)-$newWidth)]
+	$c move box3 0 [expr {5*($v(width)-$newWidth)}]
 	set v(width) $newWidth
     }
 }
diff --git a/library/demos/clrpick.tcl b/library/demos/clrpick.tcl
index eee1d7e..5c1f018 100644
--- a/library/demos/clrpick.tcl
+++ b/library/demos/clrpick.tcl
@@ -2,7 +2,7 @@
 #
 # This demonstration script prompts the user to select a color.
 #
-# RCS: @(#) $Id: clrpick.tcl,v 1.2 1998/09/14 18:23:27 stanton Exp $
+# RCS: @(#) $Id: clrpick.tcl,v 1.3 2001/06/14 10:56:58 dkf Exp $
 
 if {![info exists widgetDemo]} {
     error "This script should be run from the \"widget\" demo."
@@ -38,7 +38,7 @@ proc setColor {w button name options} {
     set initialColor [$button cget -$name]
     set color [tk_chooseColor -title "Choose a $name color" -parent $w \
 	-initialcolor $initialColor]
-    if [string compare $color ""] {
+    if {[string compare $color ""]} {
 	setColor_helper $w $options $color
     }
     grab release $w
diff --git a/library/demos/cscroll.tcl b/library/demos/cscroll.tcl
index 0289911..8aad050 100644
--- a/library/demos/cscroll.tcl
+++ b/library/demos/cscroll.tcl
@@ -3,7 +3,7 @@
 # This demonstration script creates a simple canvas that can be
 # scrolled in two dimensions.
 #
-# RCS: @(#) $Id: cscroll.tcl,v 1.2 1998/09/14 18:23:27 stanton Exp $
+# RCS: @(#) $Id: cscroll.tcl,v 1.3 2001/06/14 10:56:58 dkf Exp $
 
 if {![info exists widgetDemo]} {
     error "This script should be run from the \"widget\" demo."
@@ -48,9 +48,9 @@ set bg [lindex [$c config -bg] 4]
 for {set i 0} {$i < 20} {incr i} {
     set x [expr {-10 + 3*$i}]
     for {set j 0; set y -10} {$j < 10} {incr j; incr y 3} {
-	$c create rect ${x}c ${y}c [expr $x+2]c [expr $y+2]c \
+	$c create rect ${x}c ${y}c [expr {$x+2}]c [expr {$y+2}]c \
 		-outline black -fill $bg -tags rect
-	$c create text [expr $x+1]c [expr $y+1]c -text "$i,$j" \
+	$c create text [expr {$x+1}]c [expr {$y+1}]c -text "$i,$j" \
 	    -anchor center -tags text
     }
 }
@@ -65,14 +65,14 @@ proc scrollEnter canvas {
     global oldFill
     set id [$canvas find withtag current]
     if {[lsearch [$canvas gettags current] text] >= 0} {
-	set id [expr $id-1]
+	set id [expr {$id-1}]
     }
     set oldFill [lindex [$canvas itemconfig $id -fill] 4]
     if {[winfo depth $canvas] > 1} {
 	$canvas itemconfigure $id -fill SeaGreen1
     } else {
 	$canvas itemconfigure $id -fill black
-	$canvas itemconfigure [expr $id+1] -fill white
+	$canvas itemconfigure [expr {$id+1}] -fill white
     }
 }
 
@@ -80,17 +80,17 @@ proc scrollLeave canvas {
     global oldFill
     set id [$canvas find withtag current]
     if {[lsearch [$canvas gettags current] text] >= 0} {
-	set id [expr $id-1]
+	set id [expr {$id-1}]
     }
     $canvas itemconfigure $id -fill $oldFill
-    $canvas itemconfigure [expr $id+1] -fill black
+    $canvas itemconfigure [expr {$id+1}] -fill black
 }
 
 proc scrollButton canvas {
     global oldFill
     set id [$canvas find withtag current]
     if {[lsearch [$canvas gettags current] text] < 0} {
-	set id [expr $id+1]
+	set id [expr {$id+1}]
     }
     puts stdout "You buttoned at [lindex [$canvas itemconf $id -text] 4]"
 }
diff --git a/library/demos/ctext.tcl b/library/demos/ctext.tcl
index 51af609..fb120a8 100644
--- a/library/demos/ctext.tcl
+++ b/library/demos/ctext.tcl
@@ -3,7 +3,7 @@
 # This demonstration script creates a canvas widget with a text
 # item that can be edited and reconfigured in various ways.
 #
-# RCS: @(#) $Id: ctext.tcl,v 1.2 1998/09/14 18:23:27 stanton Exp $
+# RCS: @(#) $Id: ctext.tcl,v 1.3 2001/06/14 10:56:58 dkf Exp $
 
 if {![info exists widgetDemo]} {
     error "This script should be run from the \"widget\" demo."
@@ -58,7 +58,7 @@ $c bind text <2> "textPaste $c @%x,%y"
 # to be edited.
 
 proc mkTextConfig {w x y option value color} {
-    set item [$w create rect [expr $x] [expr $y] [expr $x+30] [expr $y+30] \
+    set item [$w create rect $x $y [expr {$x+30}] [expr {$y+30}] \
 	    -outline black -fill $color -width 1]
     $w bind $item <1> "$w itemconf text $option $value"
     $w addtag config withtag $item
@@ -68,19 +68,20 @@ set x 50
 set y 50
 set color LightSkyBlue1
 mkTextConfig $c $x $y -anchor se $color
-mkTextConfig $c [expr $x+30] [expr $y] -anchor s $color
-mkTextConfig $c [expr $x+60] [expr $y] -anchor sw $color
-mkTextConfig $c [expr $x] [expr $y+30] -anchor e $color
-mkTextConfig $c [expr $x+30] [expr $y+30] -anchor center $color
-mkTextConfig $c [expr $x+60] [expr $y+30] -anchor w $color
-mkTextConfig $c [expr $x] [expr $y+60] -anchor ne $color
-mkTextConfig $c [expr $x+30] [expr $y+60] -anchor n $color
-mkTextConfig $c [expr $x+60] [expr $y+60] -anchor nw $color
-set item [$c create rect [expr $x+40] [expr $y+40] [expr $x+50] [expr $y+50] \
+mkTextConfig $c [expr {$x+30}] [expr {$y   }] -anchor s      $color
+mkTextConfig $c [expr {$x+60}] [expr {$y   }] -anchor sw     $color
+mkTextConfig $c [expr {$x   }] [expr {$y+30}] -anchor e      $color
+mkTextConfig $c [expr {$x+30}] [expr {$y+30}] -anchor center $color
+mkTextConfig $c [expr {$x+60}] [expr {$y+30}] -anchor w      $color
+mkTextConfig $c [expr {$x   }] [expr {$y+60}] -anchor ne     $color
+mkTextConfig $c [expr {$x+30}] [expr {$y+60}] -anchor n      $color
+mkTextConfig $c [expr {$x+60}] [expr {$y+60}] -anchor nw     $color
+set item [$c create rect \
+	[expr {$x+40}] [expr {$y+40}] [expr {$x+50}] [expr {$y+50}] \
 	-outline black -fill red]
 $c bind $item <1> "$c itemconf text -anchor center"
-$c create text [expr $x+45] [expr $y-5] -text {Text Position} -anchor s \
-	-font {Times 24} -fill brown
+$c create text [expr {$x+45}] [expr {$y-5}] \
+	-text {Text Position}  -anchor s  -font {Times 24}  -fill brown
 
 # Lastly, create some items that allow the text's justification to be
 # changed.
@@ -89,10 +90,10 @@ set x 350
 set y 50
 set color SeaGreen2
 mkTextConfig $c $x $y -justify left $color
-mkTextConfig $c [expr $x+30] [expr $y] -justify center $color
-mkTextConfig $c [expr $x+60] [expr $y] -justify right $color
-$c create text [expr $x+45] [expr $y-5] -text {Justification} -anchor s \
-	-font {Times 24} -fill brown
+mkTextConfig $c [expr {$x+30}] $y -justify center $color
+mkTextConfig $c [expr {$x+60}] $y -justify right $color
+$c create text [expr {$x+45}] [expr {$y-5}] \
+	-text {Justification}  -anchor s  -font {Times 24}  -fill brown
 
 $c bind config <Enter> "textEnter $c"
 $c bind config <Leave> "$c itemconf current -fill \$textConfigFill"
@@ -131,7 +132,7 @@ proc textB1Move {w x y} {
 }
 
 proc textBs {w} {
-    if ![catch {$w dchars text sel.first sel.last}] {
+    if {![catch {$w dchars text sel.first sel.last}]} {
 	return
     }
     set char [expr {[$w index text insert] - 1}]
@@ -139,7 +140,7 @@ proc textBs {w} {
 }
 
 proc textDel {w} {
-    if ![catch {$w dchars text sel.first sel.last}] {
+    if {![catch {$w dchars text sel.first sel.last}]} {
 	return
     }
     $w dchars text insert
diff --git a/library/demos/filebox.tcl b/library/demos/filebox.tcl
index 9fd69fa..4401d06 100644
--- a/library/demos/filebox.tcl
+++ b/library/demos/filebox.tcl
@@ -2,7 +2,7 @@
 #
 # This demonstration script prompts the user to select a file.
 #
-# RCS: @(#) $Id: filebox.tcl,v 1.2 1998/09/14 18:23:28 stanton Exp $
+# RCS: @(#) $Id: filebox.tcl,v 1.3 2001/06/14 10:56:58 dkf Exp $
 
 if {![info exists widgetDemo]} {
     error "This script should be run from the \"widget\" demo."
@@ -35,7 +35,7 @@ foreach i {open save} {
     pack $f -fill x -padx 1c -pady 3
 }
 
-if ![string compare $tcl_platform(platform) unix] {
+if {![string compare $tcl_platform(platform) unix]} {
     checkbutton $w.strict -text "Use Motif Style Dialog" \
 	-variable tk_strictMotif -onvalue 1 -offvalue 0
     pack $w.strict -anchor c
@@ -62,7 +62,7 @@ proc fileDialog {w ent operation} {
 	set file [tk_getSaveFile -filetypes $types -parent $w \
 	    -initialfile Untitled -defaultextension .txt]
     }
-    if [string compare $file ""] {
+    if {[string compare $file ""]} {
 	$ent delete 0 end
 	$ent insert 0 $file
 	$ent xview end
diff --git a/library/demos/floor.tcl b/library/demos/floor.tcl
index 0afb625..2435544 100644
--- a/library/demos/floor.tcl
+++ b/library/demos/floor.tcl
@@ -3,7 +3,7 @@
 # This demonstration script creates a canvas widet that displays the
 # floorplan for DEC's Western Research Laboratory.
 #
-# RCS: @(#) $Id: floor.tcl,v 1.2 1998/09/14 18:23:28 stanton Exp $
+# RCS: @(#) $Id: floor.tcl,v 1.3 2001/06/14 10:56:58 dkf Exp $
 
 if {![info exists widgetDemo]} {
     error "This script should be run from the \"widget\" demo."
@@ -94,7 +94,7 @@ proc newRoom w {
 proc roomChanged {w args} {
     global currentRoom floorItems colors
     $w delete highlight
-    if [catch {set item $floorItems($currentRoom)}] {
+    if {[catch {set item $floorItems($currentRoom)}]} {
 	return
     }
     set new [eval \
diff --git a/library/demos/hscale.tcl b/library/demos/hscale.tcl
index fca7f20..a9b3761 100644
--- a/library/demos/hscale.tcl
+++ b/library/demos/hscale.tcl
@@ -2,7 +2,7 @@
 #
 # This demonstration script shows an example with a horizontal scale.
 #
-# RCS: @(#) $Id: hscale.tcl,v 1.2 1998/09/14 18:23:28 stanton Exp $
+# RCS: @(#) $Id: hscale.tcl,v 1.3 2001/06/14 10:56:58 dkf Exp $
 
 if {![info exists widgetDemo]} {
     error "This script should be run from the \"widget\" demo."
@@ -38,7 +38,7 @@ $w.frame.scale set 75
 
 proc setWidth {w width} {
     incr width 21
-    set x2 [expr $width - 30]
+    set x2 [expr {$width - 30}]
     if {$x2 < 21} {
 	set x2 21
     }
diff --git a/library/demos/items.tcl b/library/demos/items.tcl
index a91ab61..91ea32a 100644
--- a/library/demos/items.tcl
+++ b/library/demos/items.tcl
@@ -3,7 +3,7 @@
 # This demonstration script creates a canvas that displays the
 # canvas item types.
 #
-# RCS: @(#) $Id: items.tcl,v 1.2 1998/09/14 18:23:29 stanton Exp $
+# RCS: @(#) $Id: items.tcl,v 1.3 2001/06/14 10:56:58 dkf Exp $
 
 if {![info exists widgetDemo]} {
     error "This script should be run from the \"widget\" demo."
@@ -271,7 +271,7 @@ proc itemDrag {c x y} {
     global lastX lastY
     set x [$c canvasx $x]
     set y [$c canvasy $y]
-    $c move current [expr $x-$lastX] [expr $y-$lastY]
+    $c move current [expr {$x-$lastX}] [expr {$y-$lastY}]
     set lastX $x
     set lastY $y
 }
diff --git a/library/demos/plot.tcl b/library/demos/plot.tcl
index a1109c2..011f140 100644
--- a/library/demos/plot.tcl
+++ b/library/demos/plot.tcl
@@ -3,7 +3,7 @@
 # This demonstration script creates a canvas widget showing a 2-D
 # plot with data points that can be dragged with the mouse.
 #
-# RCS: @(#) $Id: plot.tcl,v 1.2 1998/09/14 18:23:29 stanton Exp $
+# RCS: @(#) $Id: plot.tcl,v 1.3 2001/06/14 10:56:58 dkf Exp $
 
 if {![info exists widgetDemo]} {
     error "This script should be run from the \"widget\" demo."
@@ -38,20 +38,21 @@ $c create text 225 20 -text "A Simple Plot" -font $plotFont -fill brown
 for {set i 0} {$i <= 10} {incr i} {
     set x [expr {100 + ($i*30)}]
     $c create line $x 250 $x 245 -width 2
-    $c create text $x 254 -text [expr 10*$i] -anchor n -font $plotFont
+    $c create text $x 254 -text [expr {10*$i}] -anchor n -font $plotFont
 }
 for {set i 0} {$i <= 5} {incr i} {
     set y [expr {250 - ($i*40)}]
     $c create line 100 $y 105 $y -width 2
-    $c create text 96 $y -text [expr $i*50].0 -anchor e -font $plotFont
+    $c create text 96 $y -text [expr {$i*50}].0 -anchor e -font $plotFont
 }
 
-foreach point {{12 56} {20 94} {33 98} {32 120} {61 180}
-	{75 160} {98 223}} {
+foreach point {
+    {12 56} {20 94} {33 98} {32 120} {61 180} {75 160} {98 223}
+} {
     set x [expr {100 + (3*[lindex $point 0])}]
     set y [expr {250 - (4*[lindex $point 1])/5}]
-    set item [$c create oval [expr $x-6] [expr $y-6] \
-	    [expr $x+6] [expr $y+6] -width 1 -outline black \
+    set item [$c create oval [expr {$x-6}] [expr {$y-6}] \
+	    [expr {$x+6}] [expr {$y+6}] -width 1 -outline black \
 	    -fill SkyBlue2]
     $c addtag point withtag $item
 }
@@ -92,7 +93,7 @@ proc plotDown {w x y} {
 
 proc plotMove {w x y} {
     global plot
-    $w move selected [expr $x-$plot(lastX)] [expr $y-$plot(lastY)]
+    $w move selected [expr {$x-$plot(lastX)}] [expr {$y-$plot(lastY)}]
     set plot(lastX) $x
     set plot(lastY) $y
 }
diff --git a/library/demos/puzzle.tcl b/library/demos/puzzle.tcl
index e3ee8cc..b0fa685 100644
--- a/library/demos/puzzle.tcl
+++ b/library/demos/puzzle.tcl
@@ -3,7 +3,7 @@
 # This demonstration script creates a 15-puzzle game using a collection
 # of buttons.
 #
-# RCS: @(#) $Id: puzzle.tcl,v 1.2 1998/09/14 18:23:29 stanton Exp $
+# RCS: @(#) $Id: puzzle.tcl,v 1.3 2001/06/14 10:56:58 dkf Exp $
 
 if {![info exists widgetDemo]} {
     error "This script should be run from the \"widget\" demo."
@@ -60,10 +60,10 @@ pack $w.frame -side top -pady 1c -padx 1c
 destroy $w.s
 
 set order {3 1 6 2 5 7 15 13 4 11 8 9 14 10 12}
-for {set i 0} {$i < 15} {set i [expr $i+1]} {
+for {set i 0} {$i < 15} {set i [expr {$i+1}]} {
     set num [lindex $order $i]
-    set xpos($num) [expr ($i%4)*.25]
-    set ypos($num) [expr ($i/4)*.25]
+    set xpos($num) [expr {($i%4)*.25}]
+    set ypos($num) [expr {($i/4)*.25}]
     button $w.frame.$num -relief raised -text $num -highlightthickness 0 \
 	    -command "puzzleSwitch $w $num"
     place $w.frame.$num -relx $xpos($num) -rely $ypos($num) \
diff --git a/library/demos/ruler.tcl b/library/demos/ruler.tcl
index fa20566..86f18dc 100644
--- a/library/demos/ruler.tcl
+++ b/library/demos/ruler.tcl
@@ -3,7 +3,7 @@
 # This demonstration script creates a canvas widget that displays a ruler
 # with tab stops that can be set, moved, and deleted.
 #
-# RCS: @(#) $Id: ruler.tcl,v 1.2 1998/09/14 18:23:29 stanton Exp $
+# RCS: @(#) $Id: ruler.tcl,v 1.3 2001/06/14 10:56:58 dkf Exp $
 
 if {![info exists widgetDemo]} {
     error "This script should be run from the \"widget\" demo."
@@ -19,8 +19,8 @@ if {![info exists widgetDemo]} {
 
 proc rulerMkTab {c x y} {
     upvar #0 demo_rulerInfo v
-    $c create polygon $x $y [expr $x+$v(size)] [expr $y+$v(size)] \
-	    [expr $x-$v(size)] [expr $y+$v(size)]
+    $c create polygon $x $y [expr {$x+$v(size)}] [expr {$y+$v(size)}] \
+	    [expr {$x-$v(size)}] [expr {$y+$v(size)}]
 }
 
 set w .ruler
@@ -63,7 +63,7 @@ if {[winfo depth $c] > 1} {
 
 $c create line 1c 0.5c 1c 1c 13c 1c 13c 0.5c -width 1
 for {set i 0} {$i < 12} {incr i} {
-    set x [expr $i+1]
+    set x [expr {$i+1}]
     $c create line ${x}c 1c ${x}c 0.6c -width 1
     $c create line $x.25c 1c $x.25c 0.8c -width 1
     $c create line $x.5c 1c $x.5c 0.7c -width 1
@@ -110,7 +110,7 @@ proc rulerNewTab {c x y} {
 proc rulerSelectTab {c x y} {
     upvar #0 demo_rulerInfo v
     set v(x) [$c canvasx $x $v(grid)]
-    set v(y) [expr $v(top)+2]
+    set v(y) [expr {$v(top)+2}]
     $c addtag active withtag current
     eval "$c itemconf active $v(activeStyle)"
     $c raise active
@@ -139,13 +139,13 @@ proc rulerMoveTab {c x y} {
 	set cx $v(right)
     }
     if {($cy >= $v(top)) && ($cy <= $v(bottom))} {
-	set cy [expr $v(top)+2]
+	set cy [expr {$v(top)+2}]
 	eval "$c itemconf active $v(activeStyle)"
     } else {
-	set cy [expr $cy-$v(size)-2]
+	set cy [expr {$cy-$v(size)-2}]
 	eval "$c itemconf active $v(deleteStyle)"
     }
-    $c move active [expr $cx-$v(x)] [expr $cy-$v(y)]
+    $c move active [expr {$cx-$v(x)}] [expr {$cy-$v(y)}]
     set v(x) $cx
     set v(y) $cy
 }
@@ -164,7 +164,7 @@ proc rulerReleaseTab c {
     if {[$c find withtag active] == {}} {
 	return
     }
-    if {$v(y) != [expr $v(top)+2]} {
+    if {$v(y) != $v(top)+2} {
 	$c delete active
     } else {
 	eval "$c itemconf active $v(normalStyle)"
diff --git a/library/demos/twind.tcl b/library/demos/twind.tcl
index bdb8337..8dff2dd 100644
--- a/library/demos/twind.tcl
+++ b/library/demos/twind.tcl
@@ -3,7 +3,7 @@
 # This demonstration script creates a text widget with a bunch of
 # embedded windows.
 #
-# RCS: @(#) $Id: twind.tcl,v 1.2 1998/09/14 18:23:30 stanton Exp $
+# RCS: @(#) $Id: twind.tcl,v 1.3 2001/06/14 10:56:58 dkf Exp $
 
 if {![info exists widgetDemo]} {
     error "This script should be run from the \"widget\" demo."
@@ -115,7 +115,7 @@ proc textWindOff w {
 
 proc textWindPlot t {
     set c $t.c
-    if [winfo exists $c] {
+    if {[winfo exists $c]} {
 	return
     }
     canvas $c -relief sunken -width 450 -height 300 -cursor top_left_arrow
@@ -129,20 +129,21 @@ proc textWindPlot t {
     for {set i 0} {$i <= 10} {incr i} {
 	set x [expr {100 + ($i*30)}]
 	$c create line $x 250 $x 245 -width 2
-	$c create text $x 254 -text [expr 10*$i] -anchor n -font $font
+	$c create text $x 254 -text [expr {10*$i}] -anchor n -font $font
     }
     for {set i 0} {$i <= 5} {incr i} {
 	set y [expr {250 - ($i*40)}]
 	$c create line 100 $y 105 $y -width 2
-	$c create text 96 $y -text [expr $i*50].0 -anchor e -font $font
+	$c create text 96 $y -text [expr {$i*50}].0 -anchor e -font $font
     }
     
-    foreach point {{12 56} {20 94} {33 98} {32 120} {61 180}
-	    {75 160} {98 223}} {
+    foreach point {
+	{12 56} {20 94} {33 98} {32 120} {61 180} {75 160} {98 223}
+    } {
 	set x [expr {100 + (3*[lindex $point 0])}]
 	set y [expr {250 - (4*[lindex $point 1])/5}]
-	set item [$c create oval [expr $x-6] [expr $y-6] \
-		[expr $x+6] [expr $y+6] -width 1 -outline black \
+	set item [$c create oval [expr {$x-6}] [expr {$y-6}] \
+		[expr {$x+6}] [expr {$y+6}] -width 1 -outline black \
 		-fill SkyBlue2]
 	$c addtag point withtag $item
     }
@@ -175,14 +176,14 @@ proc embPlotDown {w x y} {
 
 proc embPlotMove {w x y} {
     global embPlot
-    $w move selected [expr $x-$embPlot(lastX)] [expr $y-$embPlot(lastY)]
+    $w move selected [expr {$x-$embPlot(lastX)}] [expr {$y-$embPlot(lastY)}]
     set embPlot(lastX) $x
     set embPlot(lastY) $y
 }
 
 proc textWindDel w {
     set t $w.f.text
-    if [winfo exists $t.c] {
+    if {[winfo exists $t.c]} {
 	$t delete $t.c
 	while {[string first [$t get plot] " \t\n"] >= 0} {
 	    $t delete plot
diff --git a/library/demos/vscale.tcl b/library/demos/vscale.tcl
index d50089f..cb89ec3 100644
--- a/library/demos/vscale.tcl
+++ b/library/demos/vscale.tcl
@@ -2,7 +2,7 @@
 #
 # This demonstration script shows an example with a vertical scale.
 #
-# RCS: @(#) $Id: vscale.tcl,v 1.2 1998/09/14 18:23:30 stanton Exp $
+# RCS: @(#) $Id: vscale.tcl,v 1.3 2001/06/14 10:56:58 dkf Exp $
 
 if {![info exists widgetDemo]} {
     error "This script should be run from the \"widget\" demo."
@@ -39,7 +39,7 @@ $w.frame.scale set 75
 
 proc setHeight {w height} {
     incr height 21
-    set y2 [expr $height - 30]
+    set y2 [expr {$height - 30}]
     if {$y2 < 21} {
 	set y2 21
     }