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Semester 2/Programming 2/Assessment 3 Revision/Parameter Passing WS3.md

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+# Exercise 1
+
+```java
+class Param6
+{
+	private int x, y;
+	public Param6(int a, int b)
+	{
+		x = b;
+		y = a;
+	}
+	
+	public Param6(int a)
+	{
+		this(a, 5);
+	}
+	
+	public void method1(int x)
+	{
+		y = y + x;
+		System.out.println(y); 
+		this.x = this.x + x;
+		x = method2(y);
+		System.out.println(x);
+		System.out.println(this.x);
+	}
+	
+	public int method2(int x)
+	{
+		return x + y;
+	}
+}
+```
+
+Param6 q6 = new Param6(3);
+q6.method1(4);
+
+Param6(3) = Param6(3, 5)
+x = 5, y = 3 //Field Variables
+
+method1(4), x = 4 //Local
+y = 3 + 4 = 7
+output 7
+this.x = 5 + 4 = 9
+local x = method2(7) = 7 + 7 = 14
+output 14
+output 9
+
+# Exercise 2
+
+```java
+public int[] arrayMethod1(int size)
+{
+	int[] numbers = new int[size]; //B
+	for (int k = 0; k < size; k++)
+		numbers[k] = k*k; 
+		//C
+	return numbers;
+}
+```
+int[] arrayOfNumbers = arrayMethod1(5); //A
+
+Draw three state-of-memory diagrams to indicate the complete situation immediately after B has been executed, at C i.e. immediately before returning from the method,and finally after statement A has been fully executed. This is the order in which the statements above are executed.
+
+B) | numbers | -> int[]
+k=0, while k < 5, k increment
+numbers[0] = 0
+numbers[1] = 1
+numbers[2] = 4
+numbers[3] = 9
+numbers[4] = 16
+C) | numbers | -> 0,1,4,9,16
+A) | arrayOfNumbers | -> 0,1,4,9,16