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Initialization may also be used in compound declarations, as the next example shows.
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EXAMPLE 1.12 Initializing Variables
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#include <iostream.h> // This shows how to initialize variables as main0 -t int nl, n2 = 55, n3, n4, n5 = 44, n6; tout << n2 << ', N -CC n5 CC endl; return 0; >
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The six variables nl through n6 are all declared to have type int, but only the two variables n2 and n 5 are initialized. Some compilers (Borland C++, for example) will issue a warning if any variables are not initialized.
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INTRODUCTION TO PROGRAMMING IN C++
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1.9 CHAINED ASSIGNMENTS An assignment itself is an expression with a value. The value of the expression
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is 22. And like any other value, the value of an assignment can be used in another assignment:
y = (x = 22) ;
This is a chained assignment. First it assigns 22 to X, and then it assigns 22 to y. Compound assignments are usually written without the parentheses:
y = x = 22;
In general, the value of an assignment is the last value that it assigned.
EXAMPLE 1.13 Embedded Assignments
This shows how an assignment can be used within an expression:
#include <iostream.h> // This shows that an assignment can be part of a larger expression: main0 -i int m, n; m = (n = 66) + 9; // (n = 66) is an assignment expression << -cc n -CC endl; tout << m return 0; 75, 66
The compound assignment first assigns the value 66 to n. Then it evaluates the expression 9 obtaining the value 75. Then it assigns that value to m.
(n = 6 6 )
Embedded assignments can usually be avoided. For example, the first two lines in the program above would be better written as
int n = 66; int m = n + 9;
This also illustrates the preferred practice of initializing variables as they are declared. There are some situations in which embedded assignments do make a program more readable. For example, this single statement is better than 8 separate statements:
nl = n2 = n3 = n4 = n5 = n6 = n7 = n8 = 65535;
We will see other common examples of embedded assignments in 3. A chained assignment cannot be used as an initialization in a declaration:
int x = y = 22; // ERROR
The reason this is wrong is that initializations are not assignments. They are similar, but the compiler handles them differently. The correct way to do what was attempted above is
int x = 22, y = 22; // OK
INTRODUCTION TO PROGRAMMING IN C++
[CHAP. 1
1.10 THE SEMICOLON
In C++, the semicolon is used as a statement terminator. Every statement must end with a semicolon. This is different from other languages, notably Pascal, which use the semicolon as a statement separator. Note that lines that begin with the pound symbol # such as
#include <iostream.h>
do not end with a semicolon because they are not statements; they are preprocessing directives. We saw in the previous section that C++ statements can be interpreted as expressions. The converse is also true: expressions can be used as stand-alone statements. For example, here are two perfectly valid C++ statements:
x + y;
These statements perform no actions, so they are completely useless. Nevertheless they are valid statements in C++. We shall see some useful expression statements later. The semicolon acts like an operator on an expression. It transforms an expression into a statement. It is not a true operator because its result is a statement, not a value. But this transformational point of view helps explain the difference between an expression and a statement.
1.11 PROGRAM STYLE
The C++ programming language is a free form language: it has no requirements about where program elements must be placed on the line or on the page. Consequently the programmer has complete freedom of program style. But experienced programmers know that the tasks of writing, debugging, and maintaining successful software are greatly facilitated by using a consistent, readable programming style. Moreover, others will find your programs easier to read if you conform to standard style conventions. Here are some simple rules that most C++ programmers follow: .Put all your #include directives at the beginning of your file. Put each statement on a new line. Indent all statements within a block. Leave a space on either side of an operator, like this: n = 4. These rules are followed nearly everywhere in this book. Another worthwhile convention to follow is to choose your variable names carefully. Use short names to minimize the chances for typographical errors. But also pick names that describe what the variable represents. This is called self-documenting code. Nearly all C++ programmers follow the convention of using exclusively lowercase letters in variable names, except when a name is composed of several words where the first letter of each appended word is capitalized. For example:
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