Create 14a. for loops

Week 1: Types, condition clauses and loops/14a. for loops

@@ -0,0 +1,106 @@
+for (<initialization>; <condition>; <change>) {
+
+    <block>
+
+}
+
+
+==================================================
+
+
+
+public class Example {
+    public static void main(String[] args) {
+        for (int i=1; i<=10; i++) {
+            System.out.println(i);
+        }
+    }
+}
+
+Output:
+1
+2
+3
+4
+5
+6
+7
+8
+9
+10
+
+    
+
+==================================================
+
+
+
+Components of the loop are all optional - so you can omit the initialization, condition clause or modification (or even all of them).
+However, semicolons are mandatory.
+
+
+public static void main(String[] args) {
+        // variable initialized outside for-loop
+        int i = 1;
+        for (; i<=10; i++) {
+            System.out.println(i);
+        }
+
+        // making the variable modification inside the loop
+        for (int j = 5; j > 1;) {
+            System.out.println(j);
+            j--;
+        }
+
+        // eternal loop
+        for(;;) {
+            // this is printed until the user 
+            // closes the program: in practice the same as while(true)
+            System.out.println("Hi!");
+        }
+
+    }
+}
+ 
+
+
+==================================================
+
+
+
+
+A change in the value of a variable in a for statement is usually done with the ++ and -- operators.
+These operators increase or decrease the value of a variable by one, for example:
+
+public class Example {
+    public static void main(String[] args) {
+        int a = 3;
+        a++;
+        System.out.println(a);
+
+        a--;
+        a--;
+        System.out.println(a);
+
+        // This first prints the value and then
+        // after that increases it:
+        System.out.println(a++);
+
+        // one more print
+        System.out.println(a);
+
+    }
+}
+
+Output:
+4
+2
+2
+3
+
+
+
+
+
+
+