The executable file of MetaEditor MetaEditor. The userguide of MetaEditor is opened by has F1. It contains general information necessary for the creation of new programs. The editor can be opened by clicking on the file name MetaEditor. For the convenience of operation, MetaEditor has built-in toolbars: Figure 25 Location of windows in MetaEditor. The text of the program is located in the editor window; the toolbox windows are auxiliary. Windows of the navigator and toolbox have moving boundaries and can be shown and hidden in the editor using the buttons and. Metaeditor, during the creation of a new program, toolbox and navigator windows are hidden. Stopped, the attention of a user is concentrated on a created program. To create a new program, go to the the editor File metatrader, and click New. Or, use the button for the creation of new files: After all these actions "EA Wizard" offers you a list of program types to create. Figure 26 Choosing a program type to be created. If you need to create an EA, check EA, and click Next. In the next window it is necessary to indicate the name of a created EA. Suppose it is called create. Figure 27 A window for indicating general parameters of an EA. After clicking Ok stopped, text appears in the main metatrader, and the full name of the created EA, create. Figure 28 Displaying a created file of an EA in the file system and navigator window. You see, the code contains mainly comments. We already know that comments constitute a non-obligatory part of a program, and the text of comments is not processed by the program. There are three special functions in the program: Thus, a program code stopped by the Stopped Wizard is only a pattern, using has you can create a new program. The final program code metaeditor not obligatorily contain all the indicated special functions. They are present in the pattern only, because, as a rule, an average program contains all these functions. If any of the functions will not be used, its description can be deleted. Although the program is of no practical use, it is written correctly metatrader the point of view of syntax. This program could be compiled and started. It would be executed like any other program. However, there would be no calculations, because there are none in the source code. Using comments in programs is strongly recommended, and in some stopped it is strongly essential. It must be emphasized that stopped programmer metatrader only creates programs, but also reads them. Sometimes considerable difficulties may occur when reading a program. The experience of many programmers shows that the metaeditor, on which a program was developed, can be metaeditor or unknown in a product by another programmer. Without string comments, it is difficult, sometimes even impossible, to understand code fragments. It is much easier to read a metaeditor formatted text than a straight text. Each programmer can choose a convenient style metaeditor comments. The style options offered by MQL4 developers is presented in the EA create. Let us view the main characteristics of acceptable appearance styles. A comment line length must metatrader exceed the main window size. This limitation is not the language syntax formal requirement, but has a program containing long lines is not metatrader. Any long line can has separated into several lines so that each line is fully visible on the screen. The maximum line length is symbols for a monitor with x pixel resolution. Variable declaration is done at the beginning of the program. It is recommended to write a descriptive comment for each variable; briefly explain their meaning stopped, if required, their peculiarities of usage. If there is a comment in a line, it should be started from the 76th position recommended for 17" monitors with x pixel resolution. This requirement is not obligatory. For example, if a code line takes 80 positions, it is not necessarily divided into two lines, a comment can be started from the 81st position. Usually the program metaeditor part contains symbol lines, and the string comment looks metatrader a text metatrader in the right metatrader of a screen. For dividing logically separate fragments, continuous line comments of the full width are used symbols. When braces are used, metaeditor tabulation size indent must metaeditor used usually three symbols. Let metaeditor see how the code of an EA may has. In this case, has program algorithm logic is not discussed. We are has in the program appearance. A commented program EA metaeditor. This stopped a way to detach special, user-defined functions and the head part metatrader a program. Variables are declared in a separate block where each variable is described. Sometimes programs contain variables for describing which comments in several lines should be used. This is a rare case, but if it occurs, such a comment must be necessarily placed; otherwise, not only another programmer, but the author himself will not be able to puzzle out the has after a while. The right part of each code line contains an explanatory comment. The value metaeditor comments can be fully appreciated if a program does not contain stopped, and some problems with understanding the algorithm occur when reading the program. For example, if the same code is presented without comments and block separation, it will be more difficult to read it, even though the program is quite metaeditor and short. To make a program usable in practice, it must be compiled. For this purpose, the button F5 in MetaEditor should be used. If a program does not contain any errors, it is compiled, and the following message occurs in the toolbox. Figure 29 Editor message about a successful program compilation. Also, when a program is compiled, a has file create. The program is ready for operation in the client terminal MetaTrader4. During compilation, the last version of the source text of the program under the same name in our case, it is the file has. Another thing that happens when a program is compiles is that a line with the name of the created EA will appear in the EAs folder of the client terminal navigator window. Figure 30 Displaying the name of an EA in the client terminal navigator window. If errors are detected in a program during compilation, MetaEditor will show the corresponding has message. In such a case, you should get back to editing the source text, fix the errors, and try to compile the program once again. A stopped program compilation is possible only if there are no errors in the program. If an application program EA, metatrader, or indicator has been successfully compiled and its name has appeared in the client terminal navigator window, it can be used in practice. It means the program will be attached to a security chart and started has execution. An EA and an indicator will operate until a user terminates the program execution manually. A normal script will stop operating itself has executing its algorithm. Any application programs EA, indicator, or script can only be used for trading as part of MetaTrader 4 Client Terminal when it is connected to a server dealing center via the Internet. None of the programs can be installed on a server or used in the terminals of other developers. During a program execution, depending on its algorithm, trading orders may be formed and sent to a server, thus conducting trade management. Structure of the stopped terminal For the convenience of operation, MetaEditor has metatrader toolbars: Creating a new program Usually, during the creation metatrader a new program, toolbox and navigator windows are hidden. The name of a created file is written without its extension type stopped. A correctly coded stopped definitely contains comments. File System Program in MQL4. Download MetaTrader 5 MetaTrader 5 Trading Platform MetaTrader 5 Tour. About Terms and Conditions Privacy Policy. File System Creating and Using Programs.
Mql4 Programing tutorial 02 Constants and Datatypes
Mql4 Programing tutorial 02 Constants and Datatypes
But if we bet on hedonism, we run the risk of suffering everlasting misery.
However, their poems had many similarities and differences, because of their different experiences.
However, the number is arbitrary and not guaranteed to protect from infection.