For Monday Read 10.1-10.2 WebCT quiz 18

Program 6 Any questions?

File Practice Write code to read a file of integers and write a new file with one integer per line of the new file.

File Practice The files input1.txt and input2.txt each contain a list of numbers of type int in ascending order. Write a program to create a new file, output.txt, that contains all of the numbers from both input files in sorted order. Use a function that will accept as parameters any two open input streams and an open output stream.

Objects and Records Approaches to reading objects Approaches to writing objects Issues to deal with New lines Multiple word fields

The File Class Contains a number of methods Useful for answering questions about files

Interacting with the User How is this similar to files? How is it different?

System.in

Practice Problem Write Java code to ask for a student’s exam score out of 100. Your program is then to match the exam score to a letter grade and print the grade to the screen. The letter grade is to be calculated as follows: 90 and above A 80-89 B 70-79 C 60-69 D below 60 F

Switch Practice A program is required to read a customer’s name, a purchase amount and a tax code. The tax has been validated and will be one of the following: 0 tax exempt (0%) 1 state sales tax only (3%) 2 federal and state sales tax (5%) 3 special sales tax (7%) The program must then compute the sales tax and the total amount due and print the customer’s name, purchase amount, sales tax and total amount due.

Practice Design and write a program that will prompt for, receive, and total a collection of payroll amounts entered by the user until a sentinel amount of -99 is entered. After the sentinel has been entered, display the total payroll amount on the screen.

Problem 3 Write a program that sums a sequence of integers. Assume that the first integer read specifies the number of values remaining to be entered. Your program should read only one value at a time. A typical input sequence might be 5 100 200 300 400 500

Problem 4 Write a program that finds the smallest of several integers. Assume that input will end when a sentinel value of –999 is read. Do not count –999 as one of the integers to consider.

JFileChooser