comments added

Acsending_Order/Acsending_Order/src/three.java

@@ -5,13 +5,18 @@ public class three {
 	public static void main(String[] args) {
 		// TODO Auto-generated method stub
 		
-		int fn, sn, tn;
-		System.out.println("Enter three numbers");
+		int fn, sn, tn;// declared integers
+		System.out.println("Enter three numbers");//input prompt
 		Scanner in = new Scanner(System.in);
-		fn = in.nextInt();
+		fn = in.nextInt();// used to allow user to in put a number after pressing enter each time
 		sn = in.nextInt();
 		tn = in.nextInt();
 		
+		/* 
+		 	These "if" statements are checking each number, which the user has entered, against the other.
+		 	They are checking to see which one is biggest and putting them in order. The output will be the 3
+		 	numbers, that the user has entered, are put in ascending order.
+		*/
 		if(fn < sn)
 		{
 			if(fn < sn && sn < tn)

Leap_Year/Leap_Year/src/leap.java

@@ -11,6 +11,15 @@ public class leap {
 		Scanner in = new Scanner(System.in);
 		year = in.nextInt();
 		
+		/*
+		 	This if statement is in a particular order, it is checking the year is a leap year before
+		 	concluding that it isn't.  The reason i have the if statement check the year against 400 before 4
+		 	is to prevent the year 1900 being printed as a leap year. Then when 1900 is then checked against the next if statement
+		 	it is checked to see if is is divisible by 4 but NOT divisible by 100.  A leap year which is divisible by 100,
+		 	like the year 2000 would have already met the condition of being divisible by 400 so it wont miss it out.  
+		 	Then if the user input has not met the condition of the else if statement then it must not be a leap year.
+		*/
+		
 		if(year % 400 == 0)
 		{
 			System.out.println(year + " is a leap year");

Postage_Cost/Postage_Cost/src/cost.java

@@ -6,29 +6,45 @@ public class cost {
 	public static void main(String[] args) {
 		// TODO Auto-generated method stub
 
-		float weight;
+		float weight;// i used a float here so the user can enter a decimal number.
 		System.out.println("Please enter weight(kg)...");
 		Scanner in = new Scanner(System.in);
 		weight = in.nextFloat();
 		
+		
+		/*
+		 	This if statement will check that the weight is between a certain amount to coincide
+		 	with the given rates
+		 	
+		 	The	rates	are:
+
+				• Less than 1 kilogram: 1.5 (per kg)
+				• 1 - 2 kilograms: 3.0 (per kg)
+				• 2 - 3 kilograms: 4.0 (per kg)
+				• Over 3 kilograms: 5.0 (per kg)
+		*/
 		if(weight < 1)
 		{
-			System.out.printf(weight + "kg" + " = £" + "%.2f", weight * 1.5);
+			System.out.printf(weight + "kg" + " = £" + "%.2f", weight * 1.5); 
+			/*
+			 this and the following line of code reads like this - weight that the user has put in, 
+			 the the console then prints the kg after it and = £ of the cost of posting it 
+			 at two decimal places and is worked out by weight*1.5(per kg)
+			*/
 		}
-		
 		else if(weight < 2)
 		{
-			System.out.printf(weight + "kg" + " = £" + "%.2f", weight * 3);
+			System.out.printf(weight + "kg" + " = £" + "%.2f", weight * 3);
 		}
 		
 		else if(weight < 3)
 		{
-			System.out.printf(weight + "kg" + " = £" + "%.2f", weight * 4);
+			System.out.printf(weight + "kg" + " = £" + "%.2f", weight * 4);
 		}
 		
 		else if(weight > 3)
 		{
-			System.out.printf(weight + "kg" + " = £" + "%.2f", weight * 5);
+			System.out.printf(weight + "kg" + " = £" + "%.2f", weight * 5);
 		}
 			
 	}