new files

Task/Detect-division-by-zero/Tcl/detect-division-by-zero-1.tcl

@@ -0,0 +1,15 @@
+proc div_check {x y} {
+    if {[catch {expr {$x/$y}} result] == 0} {
+        puts "valid division: $x/$y=$result"
+    } else {
+        if {$result eq "divide by zero"} {
+            puts "caught division by zero: $x/$y -> $result"
+        } else {
+            puts "caught another error: $x/$y -> $result"
+        }
+    }
+}
+
+foreach denom {1 0 foo} {
+    div_check 42 $denom
+}

Task/Detect-division-by-zero/Tcl/detect-division-by-zero-2.tcl

@@ -0,0 +1,15 @@
+proc div_check {x y} {
+    try {
+        puts "valid division: $x/$y=[expr {$x/$y}]"
+    } trap {ARITH DIVZERO} msg {
+        puts "caught division by zero: $x/$y -> $msg"
+    } trap {ARITH DOMAIN} msg {
+        puts "caught bad division: $x/$y -> $msg"
+    } on error msg {
+        puts "caught another error: $x/$y -> $msg"
+    }
+}
+
+foreach {num denom} {42 1  42 0  42.0 0.0  0 0  0.0 0.0  0 foo} {
+    div_check $num $denom
+}