midterm for JAVA

     I.         Give the values of the following expressions, or state if it’s illegal.

String a, b, c, d;

a = "Cloud Computing!";

b = "  Algorithms  ";          (there is one space before and one space after the word)

c = "04 Mars 2013";

d = "a";

1	_________9___________	c.indexOf("0",2)
2	_________true___________	a.startsWith("Cloud C")
3	________15____________	a.substring(c.lastIndexOf('r'))
4	_______false_____________	a.substring(6,9).equals("com")
5	Colud Computing!12Cloud Computing	c+b.length() + a
6	_________true___________	d.equalsIgonreCase(“A”)

   II.            Find the output of the java code below? What do you think the programmer intended the code to do, and how would you fix it?

int sum = 0;

int product = 1;

int max = 20;

for (int i = 1; i <= max; i++)

sum = sum + i;

product = product * i;

System.out.println(“The sum is “ + sum +“ and the product is “ + product);

           

The sum is 210 and the product is 2432902008176640000. There are couple of issues in given code. The have modified the same and highlighted below.

                int sum = 0;

                long product = 1;

                int max = 20;

                for (int i=1; i<=max; i++) {

                sum = sum + i;

                product = product * i;

                }

                System.out.println("The sum is "+sum+" and the product is "+product);

product variable you given as int. When we product from 1 to 20 then result will be more that cannot be accommodated. so, we should change the data type from int to long. Also, for loop curly braces were missing because of that we are getting compilation error

III.            Write a Java GUI application that computes the cost of flowers sold at a flower stand. Five kinds of flowers—petunia, pansy, rose, violet, and carnation— are stocked and cost, respectively, 50¢, 75¢, $1.50, 50¢, and 80¢ per flower. Create an array of strings that holds the names of these flowers. Create another array that holds the cost of each corresponding flower. Your program should read the name of a flower and the quantity desired by a customer. Locate the flower in the name array and use that index to find the cost per stem in the cost array. Compute and print the total cost of the sale.

/**

 * @(#)midterm.java

 *

 * midterm application

 *

 * @author

 * @version 1.00 2019/6/26

 */

import java.util.Scanner; 

public class midterm {

   

    public static void main(String[] args) {   

   

       String[] flower = new String[5];

       flower[0]="petunia"; flower[1]="pansy"; flower[2]="rose"; flower[3]="violet"; flower[4]="carnation";

     

       double[] cost = new double[5];

       cost[0]=.50; cost[1]=.75; cost[2]=1.50; cost[3]=.50; cost[4]=.80;

       Scanner input=new Scanner(System.in);

       System.out.println("\nEnter the name of the flower you'd like: ");

       String fl=input.nextLine();

      

       boolean correct=false;

       int index=0;

     

       for(int i=0; i<5; i++)

       {

           if(fl.equals(flower[i]))

           {

               index=i;

               correct=true;

           }     

       }

     

       if(correct)

       {

           System.out.println("\nEnter quantity desired: ");

           double quantity=input.nextDouble();

           double total= quantity*cost[index];

           System.out.println("\nTotal cost of sale is: $"+ total );

       }

     

       else

           System.out.println("\nFlower not found.");

   }

}