Book Image

Introduction to Programming

By : Nick Samoylov
Book Image

Introduction to Programming

By: Nick Samoylov

Overview of this book

Have you ever thought about making your computer do what you want it to do? Do you want to learn to program, but just don't know where to start? Instead of guiding you in the right direction, have other learning resources got you confused with over-explanations? Don't worry. Look no further. Introduction to Programming is here to help. Written by an industry expert who understands the challenges faced by those from a non-programming background, this book takes a gentle, hand-holding approach to introducing you to the world of programming. Beginning with an introduction to what programming is, you'll go on to learn about languages, their syntax, and development environments. With plenty of examples for you to code alongside reading, the book's practical approach will help you to grasp everything it has to offer. More importantly, you'll understand several aspects of application development. As a result, you'll have your very own application running by the end of the book. To help you comprehensively understand Java programming, there are exercises at the end of each chapter to keep things interesting and encourage you to add your own personal touch to the code and, ultimately, your application.
Table of Contents (21 chapters)

Operator precedence and evaluation order of operands

When several operators are used in the same expression, it might not be obvious how to execute them without established rules. For example, what is the value that is going to be assigned to variable x after the following right-hand expression is evaluated:

int x = 2 + 4 * 5 / 6 + 3 + 7 / 3 * 11 - 4;

We know how to do it because we have learned operator precedence in school—just apply the multiplication and division operators first from left to right, then addition and subtraction from left to right too. But, it turned out that the author actually wanted this sequence of operator execution:

int x = 2 + 4 * 5 / 6 + ( 3 + 7 / 3 * (11 - 4));

It yields a different result.

Operator precedence and parentheses determines the sequence in which parts of an expression are evaluated. The evaluation order of operands defines for each...