1 files changed, 10 insertions, 10 deletions
diff --git a/tk/library/demos/twind.tcl b/tk/library/demos/twind.tcl
index 475cbd724bf..0a41c0d1e49 100644
--- a/tk/library/demos/twind.tcl
+++ b/tk/library/demos/twind.tcl
@@ -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
@@ -194,4 +195,3 @@ proc textWindDel w {
 proc embDefBg t {
     $t configure -background [lindex [$t configure -background] 3]
 }
-