Update Methods.md

Grade 10/Computer Science/ICS4U1/Methods.md

@@ -6,53 +6,63 @@ A java method can be interpreted as a subprogram. It is a collection of statemen
 
 ## Built- in vs User-defined Methods
 
-Built-in:
-BUild-i nmethods arep art of hte complier package such as system.out.println
+**Built-in:**
 
-Function (return) - Type: it calcualtes and return a value
+Built-in methods are part of the complier package such as `System.out.println`
+
+**Function (return) - Type:** it calcualtes and return a value
 ```java
-public static int claculate(int number){
+public static int calculate(int number){
+    return 1;
+}
 ```
 
-procedure-type: executes some commands
+**Procedure-type:** executes some commands
 
-Function (return)- type: 
-pubic static return type method name (parameter 1)
+**Function (return)- type:** 
+```java
+public static return type method-name (parameter 1)
+```
 
-procedure-type method:
+**Procedure-type method:**
+
+```java
 public static void method-name (paramenter 1)
-
+```
 ## How to create a method
 
-In general, method declarations has 5 basic components (figure 2.):
+In general, method declarations has 5 basic components:
 - **Modifier:** defines access type of the method i.e. from were it can be accessed in your application (For example: public)
 - **The return type:** the data type of the value returned by the method or void if it does not return a value (procedure and function type)
 - **Method name:** a specific names that identifies the method that  can be used to invoke it later
-- **Parameter list:** Comma separated list of the input parameter are defined preceded with their data type, within the enclosed parentheses, If there are no parameters, you must use empty parenteses()
-
-## Method declaration
+- **Parameter list:** Comma separated list of the input parameter are defined preceded with their data type, within the enclosed parentheses, If there are no parameters, you must use empty parentheses()
 - **Method body:** It is enclosed between braces. the code that you need to be execute to perfrom your intended operations
 
 ```java
 public int max(int x, int y) {
-
+    if(x > y) {
+        return x;
+    }
+    return y;
+}
 ```
 
 ## How to call a method (method invocation
 
 To invoke a method you need the method name with the parameter list defined between parentheses
 
-Exammple:
+**Exammple:**
+```
 Method Name (paramter list)
-
+```
 Must have () parentheses when calling a method, even with no passing parameters
 
 ## Pass-By-Value
-**What happens:** When a method is called ,a copy of the value of each argument is passed  to the method
+**What happens:** When a method is called, a copy of the value of each argument is passed  to the method
 
 **In the second method:** This copy can be changed inside the method, however such a change has no effect on the actual argumnet
 
-```
+```java
 int num=10;
 double decimal = 5.2;
 NumberManeuvers(num decimal);
@@ -64,8 +74,32 @@ public static void numberManeuvers(int i, double j) {
         i = 12;
     }
 }
-// output = num = 10 and decimal = 5.2
+// output: num = 10 and decimal = 5.2
 ```
 
 ## Pass-By-Reference
+**What happens:** When an object (Array, String) is passed to a method, its memory location address (rreference point) is used
 
+**The object:** Arrays & trings behave like objects
+
+**In the second method:** When their memory location is passed to the method the oject can be manipulated in the method resulting in actual changes to the object (Array, String)
+
+```
+int [] nums = {1, 2, 3};
+testingArray(num);
+System.out.println("num[0] = " + num[0] + ", num[1] = " + num[1] + ", num[2] = " + num[2]);
+
+public static void testingArray(int[] value) {
+    value[0] = 4;
+    value[1] = 5;
+    value[2] = 6;
+}
+}
+```
+
+## Benefits to methods
+There are many advantages of using methods. Some of them are listed below:
+- It makes the program well structured
+- methods enhance the readability of the code.
+- It provides an effective way for the user to reuse the existing code.
+- Allows for easier debugging.