Absolute Java (5th Edition) by Walter J. Savitch

By Walter J. Savitch

For undergraduate scholars in desktop technological know-how and machine Programming classes. Praised for offering an enticing stability of considerate examples and explanatory dialogue, best-selling writer Walt Savitchs clarify suggestions and methods in a simple sort utilizing comprehensible language and code more suitable through a collection of pedagogical instruments. Absolute Java is acceptable for either introductory and intermediate programming classes introducing Java.

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Extra info for Absolute Java (5th Edition)

Example text

3Readers who have used certain other languages, such as C or C++, may be surprised to learn that you cannot assign a value of type char to a variable of type byte. This is because Java uses the Unicode character set rather than the ASCII character set, and so Java reserves two bytes of memory for each value of type char, but naturally only reserves one byte of memory for values of type byte. This is one of the few cases where you might notice that Java uses the Unicode character set. Indeed, if you convert from an int to a char or vice versa, you can expect to get the usual correspondence of ASCII numbers and characters.

Operators that are listed higher on the list are said to have higher precedence. When the computer is deciding which of two adjacent operations to group with parentheses, it groups the operation of higher precedence and its apparent arguments before the operation of lower precedence. Some operators have equal precedence, in which case the order of operations is determined by associativity rules. 5 Unary operators of equal precedence are grouped in right-to-left order. So, for example, base + rate + hours is interpreted by Java to be the same as (base + rate) + hours And, for example, +–+rate is interpreted by Java to be the same as +(–(+rate)) For now you can think of the explicit parentheses put in by the programmer and the implicit parentheses determined by precedence and associativity rules as determining the order in which operations are performed.

What is the output produced by the following lines of program code? println(a); Assignment Compatibility As a general rule, you cannot store a value of one type in a variable of another type. 99; assigning int values to double variables The problem is a type mismatch. 99 is of type double and the variable intVariable is of type int. There are some special cases where it is permitted to assign a value of one type to a variable of another type. It is acceptable to assign a value of an integer type, such as int, to a variable of a floating-point type, such as the type double.

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