are shown in the COMMENTS example.

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Presentation transcript:

are shown in the COMMENTS example. Chapter Comments start with a double slash symbol ( ) and terminate at the end of the line. (This is one of the exceptions to the rule that the compiler ignores whitespace.) A comment can start at the beginning of the line or on the same line following a program statement. Both possibilities are shown in the COMMENTS example. may need more explanation than you do about what your program is doing. Also, you may not are today. Use comments to explain to the person looking at the listing wha details are in the program statements themselves, so the comments should concentrate on the big picture, clarifying your reasons for using a certain statement or group of statements. comment style available in C++: This type of comment (the only comment originally available in C) begins with the charac- ter pair and ends with (not with the end of the line). These symbols are harder to type (since is lowercase while is uppercase) and take up more space on the line, so this style is not generally used in C++. However, it has advantages in special situations. You can write a multi- line comment with only two comment symbols: This is a good approach to making a comment out of a large text passage, since it saves insert- ing the symbol on every line.

comment anywhere within the text of a program line: C++ Programming Basics You can also insert a comment anywhere within the text of a program line: If you attempt to use the the compiler since a style comment runs to the end of the line - pile correctly. Variables are the most fundamental part of any language. A variable has a symbolic name and memory. When a variable is given a value, that value is actually placed in the memory space assigned to the variable. Most popular languages use the same general variable types, such as integers, floating-point numbers, and characters, so you are probably already familiar with the ideas behind them. In beer. Unlike floating- point numbers, integers have no fractional part; you can express the idea of four using integers, but not four and one-half. Integer variables exist in several sizes, but the most commonly used is type . The amount of -bit system such as Windows, an to hold numbers in the range from - able in memory. While type MS-DOS and earlier versions of Windows. The ranges occupied by the various types are listed in the header file LIMITS uses several variables of type :

link it, and then run it. Examine the output window. The statements Chapter Variable of type in memory. link it, and then run it. Examine the output window. The statements define two integer variables, and . The keyword signals the type of variable. These statements, which are called declarations, must terminate with a semicolon, like other program statements. You must declare a variable before using it. However, you can place variable declarations any- necessary to declare variables before the first executable statement -used variables are located at the beginning of the program.