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Compound Assignment Statements Character, Integer, and Real Types Overflow, Underflow, and Roundoff Errors The E-Format for Floating-Point Values
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A program is a sequence of instructions for a computer to execute. Every program is written is some language. The C ++ (pronounced see-plus-plus) is one of the most widely accepted programming languages available. It allows programmers to write efficient, well-structured, object-oriented programs. This chapter introduces some of the basic C++ features. A Simple Program #include <iostream.h> // This program displays "Hello World." int main ( ) { cout << "Hello World. \n"; return 0; }
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The #include directive instructs the compiler to include the file iostream.h with our program. This file contains cout's definition. The second line is a comment and is ignored by the compiler. The third line contains the function prototype statement for the main function. This is required for every C++ program. The required parameter list is enclosed in parentheses ( ). In this example, we have no parameters. The opening and closing braces, { }, enclose the body of the main function.
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The body of the main function is the cout statement: cout << "Hello World.\n"; which directs the computer to send the string "Hello World.\n" to the cout object. The cout object ("see-out") is the console output device that usually is the display screen. The "\n" in the string is the newline character. "\n" is a single character. The return 0; causes main to return a zero value indicating to the operating system that it terminated normally. The Output Operator The symbol "<<" is called the insertion operator. It inserts objects into the output stream named on its left. The cout stream ordinarily refers to the monitor, so cout <<123 would display the number 123. 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 on its right to the object on its left. The expression values are directed out to the cout output stream. The reason that we call this a stream is that values sent to it fall in line, one after the other, as they are dropped into the stream. The following all produce the same "Hello, World." output: cout << "Hel" << "lo Wor" << "ld. \n"; cout << "He" << "llo " << "World." <<"\n"; cout << "Hello" << " " <<"World" <<".\n"; Here the message has been split into several pieces. Since there are no newline characters or other characters added to the stream they all come out as a single line, just as before. The output stream cout is used with the insertion operator << in the general form: cout <<expression <<expression... <<expression; This syntax statement says that cout is followed by one or more pairs, where each consists of the << operator followed by some expression. Characters, String Literals, and String Length The symbol 'A' is a character literal. It is a single character in length and is enclosed in a pair of single quotes. A character is any member of a predefined character set or alphabet. Most computers today use the ASCII (American Standard Code for Information Interchange) character set.
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You Need to Know Some additional non-printing characters such as the newline character, '\n', are also contained in the ASCll character set. The backslash character, '\', is Used with a printing character to represent some useful non-printing characters. Some such characters are the horizontal tab character '\t', the alert character, '\a', the quote character, '\"', and the backslash character itself '\\'. Internally, a character requires one byte of storage.
The expression "Hello" is called a string literal. It consists of a sequence of characters delimited by quotation marks. The length of a string literal is the number of characters it contains. The string literal "ABCDE" has length 5. C++ provides a predefined function named strlen ( ) that can be used to obtain the length of a string. In the machine a C++ string of length n actually requires n + 1 bytes of memory for its storage. This is because the null character is appended after the last character in the string to indicate the end of the string. The null character is the character '\0'. Note that the character 'a' requires one byte of storage and the string literal "a" requires two bytes; one for the 'a' and one for the terminating '\n'. Example 1.1 Print String Lengths #include <iostream. h> #include <string.h> // This program tests the strlen function int main ( ) { cout << strlen("Hello, World.\n") << '\n'; cout << strlen("Hello, World.") << '\n'; cout << strlen("Hello, ") << '\n'; cout << strlen("H") << '\n'; cout << strlen("") << '\n'; return 0; }
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