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ELEMENTARY C++ PROGRAMMING
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reads the program the same as if it were written all on one line, like this:
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#include <iostream> int main(){std::cout<<"Hello, World!\n";}
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Blank spaces are ignored by the compiler except where needed to separate identifiers, as in
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int main
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Note that the preprocessor directive must precede the program on a separate line. EXAMPLE 1.2 Another Hello, World Program
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This program has the same output as that in Example 1.1: #include <iostream> using namespace std; int main() { // prints "Hello, World!": cout << "Hello, World!\n"; return 0; } The second line using namespace std; tells the C++ compiler to apply the prefix std:: to resolve names that need prefixes. It allows us to use cout in place of std::cout. This makes larger programs easier to read. The fourth line { // prints "Hello, World!" includes the comment prints "Hello, World!" . A comment in a program is a string of characters that the preprocessor removes before the compiler compiles the programs. It is included to add explanations for human readers. In C++, any text that follows the double slash symbol //, up to the end of the line, is a comment. You can also use C style comments, like this: { /* prints "Hello, World!" */ A C style comment (introduced by the programming language named C ) is any string of characters between the symbol /* and the symbol */. These comments can run over several lines. The sixth line return 0; is optional for the main() function in Standard C++. We include it here only because some compilers expect it to be included as the last line of the main() function.
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A namespace is a named group of definitions. When objects that are defined within a namespace are used outside of that namespace, either their names must be prefixed with the name of the namespace or they must be in a block that is preceded by a using namespace statement. Namespaces make it possible for a program to use different objects with the same name, just as different people can have the same name. The cout object is defined within a namespace named std (for standard ) in the <iostream> header file. Throughout the rest of this book, every program is assumed to begin with the two lines
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#include <iostream> using namespace std;
These two required lines will be omitted in the examples. We will also omit the line
return 0;
from the main() function. Be sure also to include this line if you are using a compiler (such as Microsoft Visual C++) that expects it.
ELEMENTARY C++ PROGRAMMING
[CHAP. 1
1.3 THE OUTPUT OPERATOR The symbol << is called the output operator in C++. (It is also called the put operator or the stream insertion operator.) It inserts values into the output stream that is named on its left. We usually use the cout output stream, which ordinarily refers to the computer screen. So the statement
cout << 66;
would display the number 66 on the screen. An operator is something that performs an action on one or more objects. The output operator << performs the action of sending the value of the expression listed on its right to the output stream listed on its left. Since the direction of this action appears to be from right to left, the symbol << was chosen to represent it. It should remind you of an arrow pointing to the left. The cout object is called a stream because output sent to it flows like a stream. If several things are inserted into the cout stream, they fall in line, one after the other as they are dropped into the stream, like leaves falling from a tree into a natural stream of water. The values that are inserted into the cout stream are displayed on the screen in that order. EXAMPLE 1.3 Yet Another Hello, World Program
This program has the same output as that in Example 1.1: int main() { // prints "Hello, World!": cout << "Hel" << "lo, Wo" << "rld!" << endl; } The output operator is used four times here, dropping the four objects "Hel", "lo, Wo", "rld!", and endl into the output stream. The first three are strings that are concatenated together (i.e., strung end-to-end) to form the single string "Hello, World!". The fourth object is the stream manipulator object endl (meaning end of line ). It does the same as appending the endline character '\n' to the string itself: it sends the print cursor to the beginning of the next line. It also flushes the output buffer.
1.4 CHARACTERS AND LITERALS The three objects "Hel", "lo, Wo", and "rld!" in Example 1.3 are called string literals. Each literal consists of a sequence of characters delimited by quotation marks. A character is an elementary symbol used collectively to form meaningful writing. English writers use the standard Latin alphabet of 26 lower case letters and 26 upper case letters along with the 10 Hindu-Arabic numerals and a collection of punctuation marks. Characters are stored in computers as integers. A character set code is a table that lists the integer value for each character in the set. The most common character set code in use at the end of the millennium is the ASCII Code, shown in Appendix A. The acronym (pronounced as-key ) stands for American Standard Code for Information Interchange. The newline character '\n' is one of the nonprinting characters. It is a single character formed using the backslash \ and the letter n. There are several other characters formed this way, including the horizontal tab character '\t' and the alert character '\a'. The backslash is also used to denote the two printing characters that could not otherwise be used within a string literal: the quote character \" and the backslash character itself \\.
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