Chapter 9. PC #2. Word Counter (page 608)

Write a (JAVA) method that accepts a String object as an argument and returns the number of words it contains. For instance, if the argument is Four score and seven years ago the

method should return the number 6. Demonstrate the method in a program that asks the user to input a string and then passes it to the method. The number of words in the string should be displayed on the screen.

View required output

Question 2 100 points

Chapter 9. PC #8. 8. Sum of Numbers in a String (page 610)

Write a program that asks the user to enter a series of numbers separated by commas. Here are two examples of valid input:

7,9,10,2,18,6

8.777,10.9,11,2.2,-18,6

The program should calculate and display the sum of all the numbers.

Input Validation

1. Make sure the string only contains numbers and commas (valid symbols are '0'-'9', '-', '.', and ',').

2. If the string is empty, a messages should be displayed, saying that the string is empty.

View required output

Test Case 1

Standard Input

7,9,10,2,18,6ENTER ENTER 8.777,10.9,11,2.2,-18,6ENTER quitENTER 

Output: Enter a series of numbers separated only by commas or type QUIT to exit: The sum of those numbers is 52.00 Enter a series of numbers separated only by commas or type QUIT to exit: Empty string. Enter a series of numbers separated only by commas or type QUIT to exit: The sum of those numbers is 20.88 Enter a series of numbers separated only by commas or type QUIT to exit: 

Test Case 2

Standard Input

invalid_input_hereENTER 1,2,3ENTER quitENTER 

Output: Enter a series of numbers separated only by commas or type QUIT to exit: Invalid input. Enter a series of numbers separated only by commas or type QUIT to exit: The sum of those numbers is 6.00 Enter a series of numbers separated only by commas or type QUIT to exit: