while loops

examples/programs/while_loop/main.bro

@@ -0,0 +1,52 @@
+# Milestone 5: boolean while loops with optional post-iteration updates.
+
+return_before_update :: func() i32 {
+	i i32 = 0
+	while true : i = i + 1 {
+		return i
+	}
+}
+
+main :: func() i32 {
+	total i32 = 0
+
+	# ordinary condition and update
+	i u32 = 0
+	while i < 5 : i = i + 1 {
+		total = total + 2
+	}
+
+	# equivalent parenthesized header
+	j u32 = 0
+	while (j < 4) : (j = j + 1) {
+		total = total + 3
+	}
+
+	# nested loops and body-local storage
+	outer u32 = 0
+	while outer < 2 : outer = outer + 1 {
+		inner u32 = 0
+		while inner < 3 : inner = inner + 1 {
+			total = total + 2
+		}
+	}
+
+	# The body-local k shadows only inside the body. The update still targets
+	# the mutable k declared before the loop.
+	k u32 = 0
+	while k < 4 : k = k + 1 {
+		k u32 = 100
+		if k == 100 {
+			total = total + 2
+		}
+	}
+
+	# zero iterations
+	while false {
+		total = total + 100
+	}
+
+	# A return exits before the update clause.
+	total = total + return_before_update()
+	return total
+}