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Characters can be used in a program statement as part of a string literal, or as individual objects. When used individually, they must appear as character constants. A character constant is a character enclosed in single quotes. As individual objects, character constants can be output the same way string literals are. EXAMPLE 1.4 A Fourth Version of the Hello, World Program
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This program has the same output as that in Example 1.1: int main() { // prints "Hello, World!": cout << "Hello, W" << 'o' << "rld" << '!' << '\n'; } This shows that the output operator can process characters as well as string literals. The three individual characters 'o', '!', and '\n' are concatenated into the output the same was as the two string literals "Hello, W" and "rld".
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EXAMPLE 1.5 Inserting Numeric Literals into the Standard Output Stream
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int main() { // prints "The Millennium ends Dec 31 2000.": cout << "The Millennium ends Dec " << 3 << 1 << ' ' << 2000 << endl; } When numeric literals like 3 and 2000 are passed to the output stream they are automatically converted to string literals and concatenated the same way as characters. Note that the blank character (' ') must be passed explicitly to avoid having the digits run together.
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1.5 VARIABLES AND THEIR DECLARATIONS A variable is a symbol that represents a storage location in the computer s memory. The information that is stored in that location is called the value of the variable. One common way for a variable to obtain a value is by an assignment. This has the syntax
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variable = expression;
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First the expression is evaluated and then the resulting value is assigned to the variable. The equals sign = is the assignment operator in C++. EXAMPLE 1.6 Using Integer Variables
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In this example, the integer 44 is assigned to the variable m, and the value of the expression m + 33 is assigned to the variable n: int main() { // prints "m = 44 and n = 77": int m, n; m = 44; // assigns the value 44 to the variable m cout << "m = " << m; n = m + 33; // assigns the value 77 to the variable n cout << " and n = " << n << endl; } The output from the program is shown in the shaded panel at the top of the next page.
ELEMENTARY C++ PROGRAMMING
[CHAP. 1
m = 44 and n = 77
We can view the variables m and n like this: m 44 n 77 int int The variable named m is like a mailbox. Its name m is like the address on a mailbox, its value 44 is like the contents of a mailbox, and its type int is like a legal classification of mailboxes that stipulates what may be placed inside it. The type int means that the variable holds only integer values. Note in this example that both m and n are declared on the same line. Any number of variables can be declared together this way if they have the same type.
Every variable in a C++ program must be declared before it is used. The syntax is
specifier type name initializer;
where specifier is an optional keyword such as const (see Section 1.8), type is one of the C++ data types such as int, name is the name of the variable, and initializer is an optional initialization clause such as =44 (see Section 1.7). The purpose of a declaration is to introduce a name to the program; i.e., to explain to the compiler what the name means. The type tells the compiler what range of values the variable may have and what operations can be performed on the variable. The location of the declaration within the program determines the scope of the variable: the part of the program where the variable may be used. In general, the scope of a variable extends from its point of declaration to the end of the immediate block in which it is declared or which it controls. 1.6 PROGRAM TOKENS A computer program is a sequence of elements called tokens. These tokens include keywords such as int, identifiers such as main, punctuation symbols such as {, and operators such as <<. When you compile your program, the compiler scans the text in your source code, parsing it into tokens. If it finds something unexpected or doesn t find something that was expected, then it aborts the compilation and issues error messages. For example, if you forget to append the semicolon that is required at the end of each statement, then the message will report the missing semicolon. Some syntax errors such as a missing second quotation mark or a missing closing brace may not be described explicitly; instead, the compiler will indicate only that it found something wrong near that location in your program. EXAMPLE 1.7 A Program s Tokens
int main() { // prints "n = 44": int n=44; cout << "n = " << n << endl; } The output is n = 44 This source code has 19 tokens: int , main , ( , ) , { , int , n , = , 44 , ; , cout , << , "n = " , << , n , << , endl , ; , and } . Note that the compiler ignores the comment symbol // and the text that follows it on the second line.
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