Question

Using Java

Create an application that creates and displays a list of names using an array. Then modify the application to create and use a list of numbers.

Console for the names application

Please enter a name or type “exit” to quit: Diane

Please enter a name or type “exit” to quit: Joe

Please enter a name or type “exit” to quit: Greta

Please enter a name or type “exit” to quit: Henry

Please enter a name or type “exit” to quit: exit

The names you entered were:

Diane

Joe

Greta

Henry

Console for the numbers application

Please enter a number or type “exit” to quit: 12.5

Please enter a number or type “exit” to quit: 75

Please enter a number or type “exit” to quit: 200

Please enter a number or type “exit” to quit: -.02

Please enter a number or type “exit” to quit: exit

The numbers you entered were:

12.5

75

200

-.02

Sum: 287.48

Average: 71.87

Chapters 7-13 Review Exercise 2: Names and Numbers (continued)

Specifications

Part 1:

• Prompt the user to enter a first name, or enter “exit” to quit.
• Notice there will be only one prompt in this program, instead of one to get the name and the other to ask if the user wants to continue.
• Store all names in an array. When the user enters “exit” display all the names entered.

Part 2:

• Make a copy of the program you have just written, and modify it as follows.
• Prompt the user to enter a number, or enter “exit” to quit.
• The numbers entered may be decimal numbers or integers.
• Store all numbers in an array.
• When the user enters “exit”, display the numbers entered, their sum, and the average.
• For this version of the program, you must read everything as a string, and then convert the numbers appropriately before performing the calculations.

Answer 1

import java.util.Scanner;

public class Names {
   public static void main(String[] args) {
       Scanner sc = new Scanner(System.in);
       String arr[]=new String[100];
       int size=0;
       String s;
       while(true) {
           System.out.println("Please enter a name or type 'exit' to quit: ");
           s=sc.nextLine();
           if(s.equalsIgnoreCase("exit"))
               break;
           arr[size++]=s;
          
       }
       System.out.println("The names you entered were:");
       for(int i=0;i<size;i++)
           System.out.println(arr[i]);
   }
}

import java.util.Scanner;

public class Numbers {
   public static void main(String[] args) {
       Scanner sc = new Scanner(System.in);
       double arr[]=new double[100];
       int size=0;
       String s;
       double sum=0;
       while(true) {
           System.out.println("Please enter a name or type 'exit' to quit: ");
           s=sc.nextLine();
           if(s.equalsIgnoreCase("exit"))
               break;
           arr[size]=Double.parseDouble(s);
           sum+=arr[size++];
       }
       System.out.println("The names you entered were:");
       for(int i=0;i<size;i++)
           System.out.println(arr[i]);
       System.out.println("Sum: "+sum);
       System.out.println("Average: "+(sum/size));
   }
}

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