Improve the learn about the statement of circulation ~

Author: GoogTech

Circulation_Statement/Nested_loop_1.sh

@@ -0,0 +1,13 @@
+#Descriptio : Nested loop.
+#Author : HuangYuhui
+#Date : January 17,2018
+
+#!/bin/bash
+
+for num in 1 2 3 4 5 6
+do
+	for char in "a b c d e f"
+		do
+			echo $num $char
+		done
+done

Circulation_Statement/continue_break.sh

@@ -0,0 +1,65 @@
+#Description : Continue and break statement.
+#Author : HuangYuhui
+#Date : January 17,2018
+
+#!/bin/bash
+
+#Learn the contiune statement.
+#It's will be output : 4 5 6
+for var in 1 2 3 4 5 6
+do
+	if [ $var -le 3 ];then	#'-le' meaning : 'The condition is ture if the '$var' less than or equal to three'.
+		continue
+	fi
+	echo "var=$var"
+done
+
+#Learn the break statement.
+#It's will be output : 1 2
+a=1
+while [ $a -le 5 ]	#'-le' meaning : 'less than or equal'.
+do
+	if [ $a -eq 3 ];then #'-eq' meaning :'equal'
+		break
+	fi
+
+	echo "a=$a"
+	a=$[ $a+1 ]
+done
+
+echo "Break out of the inner loop with the break statement."
+a=1
+while [ $a -le 5 ]
+do
+	echo "Outer loop output : a=$a"
+	a=$[ $a+1 ]
+
+	for var in 1 2 3 4 5 6
+		do
+			if [ $var -eq 3 ];then
+					break
+			fi
+			echo "Inner loop output : var=$var"
+			var=$[ $var+1 ]
+		done
+
+done
+
+echo "Break out of the multiple circulation with the break statement."
+a=1
+while [ $a -le 5 ]
+do
+	echo "Outer loop output : a=$a"
+	a=$[ $a+1 ]
+
+	for val in 1 2 3 4 5
+	do
+		if [ $val -eq 3 ]
+		then
+				break 2	#Break out of the while circulation.
+		fi
+		echo "Inner loop output : val=$val"
+		val=$[ $val+1 ]
+	done
+done
+