February 2017
Beginner
1056 pages
28h 57m
English
Content preview from Java: An Introduction to Problem Solving and Programming, 8th EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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2.3 Keyboard and Screen I/O
Garbage in, garbage out.
—PROGRAMMER'S SAYING
Input and output of program data are usually referred to as I/O. A Java program can perform I/O in many different ways. This section presents some very simple ways to handle text as either input typed at the keyboard or output sent to the screen. In later chapters, we will discuss more elaborate ways to do I/O.
Screen Output
We have been using simple output statements since the beginning of this book. This section will summarize and explain what we have already been doing. In Listing 2.3, we used statements such as the following to send output to the display screen:
System.out.println("Enter a whole number from 1 to 99."); . . . System.out.println(quarters + "quarters"); ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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