add qr code to ssrs report INTRODUCTION TO PROGRAMMING IN C++ in Software

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INTRODUCTION TO PROGRAMMING IN C++
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The \n symbol is the newline symbol. Note that this single symbol is formed from the two characters \ and n'. Putting this symbol at the end of the quoted string tells the system to begin a new line after printing the preceding characters, thus ending the current line. The sixth line contains the statement return 0. That terminates the execution of the program and returns control to the computer s operating system. The number 0 is used to signal that the program has ended successfully. The output statement on the fifth line includes several common C++ symbols. The symbol <C is called the output operator or the insertion operator. It inserts the message into the output stream. The symbol \n included at the end of the message stands for the newline character. Whenever it appears in an output message, it causes the current line of output to be terminated, thereby starting a new line. Note that both of these symbols (< < and \n) require two characters, side-by-side, with no space between them. Note the semicolon ; at the ends of the fifth and sixth lines. C++ requires every statement to end with a semicolon. It need not be at the end of a line. We may put several statements on the same line, and we may have one statement extend over several lines. But no matter how it is positioned on one or more lines, every statement must end with a semicolon. We can imagine the relationship of the tout obiect to the program and the displav screen like this:
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Hello, World. I#include main0 .{ tout > <iostream.h> << "Hello, World.\n";
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The output stream cou t acts as a conduit, piping the output from the program to the display screen (or printer or other output device), byte by byte.
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The program in Example 1.1 is not minimal. Only some of its parts are required for every program. In fact, a C++ program need not have any statements. Of course, such an empty program will not do anything. The next example shows the shortest possible C++ program.
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EXAMPLE 1.2 The Shortest C++ Program
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This empty program does nothing. It simply reveals the required skeleton for every C++ program.
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The return 0; statement is not required by most compilers. Some compilers will issue a warning if it is omitted. We include it in each example in this first chapter. It is also recommended that you include at the beginning of every program a brief comment that describes what the program does.
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INTRODUCTION TO PROGRAMMING IN C++
1.2 THE OUTPUT OPERATOR The symbol C< is called the insertion operator or the output operator. It inserts objects into the output stream named on its left. We usually use the tout output stream, which ordinarily refers to the computer screen. So cou t -CC 6 6 would display the number 66 on the screen. An operator is something that performs an action on one or more objects. The output operator C-C 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 reason tout is called a stream is that output sent to it flows like a stream. If several things are sent to tout, they fall in line, one after the other as they are dropped into the stream. Then they are displayed on the screen in that order.
EXAMPLE 1.3 The Hello World Program Again
This version of our Hello World program has the same output as the other:
#include // This main0 <iostream.h> program illustrates the sequential ouput of several strings.
tout << "Hello, ' << "War" return 0;
Helko, TEJorZd:
CC "ld.\n";
Here the message has been split into three pieces. As the line is executed from left to right, each piece is dropped into the output stream: first I He1 lo, , then I War", and finally I Id. \n". Since there are no newline characters or other symbols added to the stream between these three pieces, they all come out concatenated into a single line, just as before.
The output stream tout is usually used with the insertion operator << in this general form:
tout c-c expression cc expression -cc . . . << expression;
This syntax statement says that cou t is followed by one or more pairs, where each pair consists of the insertion operator C< followed by some expressi on. In Example 1.3, there are three such pairs. 1.3 CHARACTERS AND STRING LITERALS The symbol I He1 10, I is called a string literal. It consists of a sequence of characters delimited by quotation marks. A character is any member of a predefined character set or alphabet. Most computers these days use the ASCII (American Standard Code for Information Interchange) character set. See Appendix A for the complete code. This set includes the 52 uppercase and lowercase letters of the alphabet, the 10 digits, all the punctuation symbols found on your keyboard, and some nonprinting characters. \
The newline character 1\n ' is one of the nonprinting characters. It is formed using the backslash \ and the letter n. There are several other characters formed this way, including the horizontal tab character I\ t I that moves to the next tab stop on the line the alert character I\a 1 that produces the system beep when printed. The backslash is also used to denote the two printing characters that could not otherwise be used within a string literal: the quote character \ I and the backslash character itself \ \. 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.
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