Question

EX 1) Determine the outcome of the following code fragment without writing and running the program.

int num = 0, max = 20;

while (num <= max)

{

    System.out.println(num);

    num += 4;

}

EX 2) Write a code fragment that reads and prints integer values entered by user until a particular sentinel value (stored in constant SENTINEL) is entered. Do not print the sentinel value.

Ex 3)  Write a method called averageLargestTwo  that accepts three int parameters  and returns the average of the two largest numbers. For example, 1,5,9 method returns result of 7.  For numbers 5,8,5 method returns 6.5.

public double averageLargestTwo ( int n1, int n2, int n3 ) {     }

Answer 1

EX 1) Output of the fragment is:

0
4
8
12
16
20

Ex 2)

final int SENTINEL = 7;
while(true)
        {
                System.out.print("Enter a value: "); //input prompt
                int val = sc.nextInt(); //take input from user
                if(val == SENTINEL) //check if value is equal to the sentinel
                {
                        break; //break the loop
                }
                System.out.println(val); //else print the value
        }

Output:

Enter a value: 1 1 Enter a value: 2 2 Enter a value: 3 3 Enter a value: 4 4 Enter a value: 5 5 Enter a value: 6 6 Enter a value: 7

EX3) Write a method called averageLargestTwo  that accepts three int parameters  and returns the average of the two largest numbers. For example, 1,5,9 method returns result of 7.  For numbers 5,8,5 method returns 6.5.

public static double averageLargestTwo(int n1, int n2, int n3)
        {
                int largest = 0; //set largest as 0
                int slargest = 0; //set second largest as 0
                if(n1 > n2 && n1 > n3) //if n1 is greater than both n2 and n3
                {
                        largest = n1;//n1 is the largest 
                        if(n2>n3) //if n2>n3, n2 is second largest 
                        {
                                slargest = n2;
                        }
                        else
                        {
                                slargest = n3; //else n3 is second largest 
                        }
                }
                else if(n2 > n1 && n2 > n3) //if n2 is greater than both n1 and n3
                {
                        largest = n2; //n2 is largest 
                        if(n1 > n3) //if n1 is larger than n3
                        {
                                slargest = n1; //n1 is 2nd largest 
                        }
                        else
                        {
                                slargest = n3; //else n3 is 2nd largest 
                        }
                }
                else
                {
                        largest = n3; //else n3 is largest 
                        if(n1>n2) //if n1>n2
                        {
                                slargest = n1; //second largest is n1 if it is greater than n2
                        }
                        else
                        {
                                slargest = n2; //else second largest is n2 if greater than n1
                        }
                }
                return (double)(largest + slargest)/2; //return average of largest two.
        }

System.out.println(averageLargestTwo(5, 9, 8));

gives output : 8.5 (if you want to call the function without creating an object, please declare it as static)