An ELSE statement is employed in conjunction with the IF statement. The ELSE statement will perform alternative computations and actions when the IF condition is not fulfilled. If the conditional statement is not true, the alternative block code after ELSE will be executed. As You can trade forex for someone else. It can be a casual partnership that doesn’t need any certifications or a professional service for which you may have to be certified with the SEC or FINRA. Go through all the risks of forex trading with your friends before accepting to trade for them. Throughout this article, we’ll discuss the pros and cons of trading forex for other people 1/30/ · Operator If-Else adalah sebuah ungkapan untuk operator yang mengontrol suatu kondisi antara pilihan benar dan salah. Jika ungkapan benar, operator akan menjalankankan program selanjutnya, namun jika ungkapan salah, operator akan menghentikan proses program. Ciri-ciri yang paling terlihat adalah adanya operator (if) dan operator (Else).Estimated Reading Time: 1 min
Operator If-Else Di EA - Artikel Forex
MQL4 Book Operators Conditional Operator 'if - else'. As a rule, if you write an application program, you need to code several solutions in one program. To solve these tasks, if else forex, you can use the conditional operator 'if-else' in your code. The full-format if else forex 'if-else' contains a heading that includes a condition, if else forex, body 1, the key word 'else', and body 2.
The bodies of the operator may consist of one or several operators; the bodies are enclosed in braces. The operator 'if-else' can be used without its 'else' part. In this case, the operator 'if-else' contains its header that includes a condition, and body if else forex that consists of one or several operators and enclosed in braces.
If the body of the operator 'if-else' consists of only one operator, you can omit the enclosing braces. One of solutions for this problem may be, for example, as follows onelevel. mq4 :. It should be noted, first of all, that the program is created as an Expert Advisor. This implies that the program will operate for quite a long time in order to display the necessary message on the screen as soon as the price exceeds the preset level.
The program has only one special function, start. At the start of the function, the variables are declared and commented. Then the price level is set in numeric values and the current price is requested, if else forex. As soon as the control in the executing program is passed to the operator 'if-else', the program will start to test its condition. Please note that the conditional test in the operator 'if-else' is the inherent property of this operator.
This test cannot be omitted during execution of the operator 'if-else', if else forex, it is a "raison d'etre" of this operator and will be performed, in all cases. Thereafter, according to the results of this test, the control will be passed to either the operator's body or outside it - to the operator that follows the closing brace. In Fig. A block diagram for execution of the operator 'if-else' in program onelevel, if else forex. In this and all following diagrams, a diamond represents the conditional check.
Arrows show the target components, to which the control will be passed after the current statement block has been executed the term of statement block means a certain random set of operators adjacent to each other.
Let's consider the diagram in more details. The block of "Previous Calculations" a gray box in the diagram in program onelevel. mq4 includes the following:. After the last operator in this block has been if else forex, the control is passed to the header of the operator 'if-else' where the condition of Does the price exceed if else forex preset level? the diamond box in the diagram, Fig. In other words, we can say that the program at this stage is groping for the answer to the following question: Is the statement enclosed in parentheses true?
The statement itself sounds literally as it is written: The value of the variable Price exceeds that of the variable Level the price exceeds the preset level. By the moment of checking this statement for being true or false, the program has already had the numeric values of variables Price and Level.
The answer depends on the ratio between these values. If the price is below the preset level the value of Price is less or equal to the value of Levelthe statement is false; if the price exceeds this level, the statement is true.
Thus, where to pass the control after the conditional test depends on the current market situation! If the price for a symbol remains below the preset level the answer is Noi. If the price for a symbol exceeds the level preset in the program the answer is Yes, i. The execution the function Alert will result in displaying on the screen a small box containing the following message:.
The function Alert is the only operator in the body of the operator 'if-else', this is why after its execution, the operator 'if-else' is considered to be completely executed, and the control is passed to the operator that follows the operator 'if-else', if else forex, i. The execution of the operator 'return' results in that the function start finishes its work, and the program switches to the tick-waiting mode.
At a new tick that also bears a new price for the symbolthe function start will be executed again. So the message coded in the program will or won't be given to the trader depending on whether the new price exceeds or does if else forex exceed the preset level. The operators 'if-else' can be nested. In order to demonstrate how the nested operators can be used, let's consider the next example.
The problem in it is a bit more sophisticated. A block diagram of operators 'if-else' to be executed in program twolevel.
The program that realizes this if else forex can be as follows twolevel. As is easy to see, the code in program twolevel. mq4 is the extended version of program onelevel. If we had only one level of calculations before, we have two levels in this new program. Each level was defined numerically, and the program, to solve the stated problem, has two blocks that track the price behavior: Falls the price within the range of values limited by the preset levels or is it outside this range?
After the preparatory calculations have been performed, the control is passed to the first operator 'if-else':. Whatever events take place at the execution of this operator whether a message is given to the trader or notafter its execution the control will be passed to the next operator 'if-else':. The consecutive execution of both operators results in the possibility to perform both conditional tests and, finally, to solve the problem.
While the program solves the task in full, this solution cannot be considered as absolutely correct. Please note a very important detail: The second conditional test will be executed regardless of the results obtained at testing in the first block.
The second block will be executed, even in the case of the price exceeding the first level. It should be noted here, that one of the important objectives pursued by the programmer when writing his or her programs is algorithm optimization. The above examples are just a demonstration, so they represent a short and, respectively, quickly executed program. Normally, a program intended to be used in practice is much larger. It can process the values of hundreds of variables, use multiple tests, each being executed within a certain amount of time.
All this may result in the risk of that the duration of working of the special function start may exceed the tick gaps. This will mean that some ticks may remain unprocessed. This is, of course, an extremely undesirable situation, and the programmer must do his or her best in order to prevent it. One of the techniques allowing if else forex to reduce the time of the program execution is algorithm optimization.
Let's consider the latest example once again, this time in terms of resources saving. For example, what is if else forex reason for asking "Is the price below the preset level? It is clear that, in this case, the price cannot be below the lower if else forex, so there is no need to make a conditional test in the second block nor to execute the set of operators in this block.
A If else forex diagram for execution of the operator 'if-else' in program twoleveloptim. According the algorithm shown in the above block diagram, no redundant operations will be executed in the if else forex. After the if else forex calculations, the program will test whether The price is above the preset level. If yes, the program displays the corresponding message to the trader and passes the control to Subsequent Calculationswhereas the second condition Is the price below the preset level?
is not tested. Only if the price hasn't turned out to be above the upper level the answer is Nothe control is passed to the second block where the necessary conditional if else forex is performed.
If the price turns out to be below the lower level, the corresponding message will be displayed to the trader, if else forex.
If not, the control will be passed to the further calculations. It is obvious that, if the program works according this algorithm, no redundant actions are performed, which results in considerable saving of resources. The programmed implementation of this algorithm implies the use of the nested operator 'if-else' twoleveloptim.
The operator 'if-else', in which the second condition is tested, if else forex, is a component of the first operator 'if-else' that tests the first condition. Nested operators are widely used in the programming practice.
This is often reasonable and, in some cases, the only possible solution, if else forex. Of course, instead of the function Alertreal programs can if else forex other functions or operators performing various useful actions. The statement of this problem is similar to that of Problem The difference consists in that, if else forex, in this case, we are not interested in the direction of the price movement if else forex higher or lower than the predefined range.
According to the problem situation, we have to know only the fact itself: Is the price within or outside the range? We can use the same text for the message to be displayed.
Here, like in the preceding solutions, it is necessary to check the price status as related to two levels - the upper one and the lower one. We have rejected the solution algorithm shown in Fig. So, according to the above reasoning, we can propose the following solution:.
The block diagram of one of the solutions of problem However, there if else forex no need to use this algorithm. The diagram demonstrates that the algorithm implies the usage of the same block of messages at different points in the program.
The program lines will be repeated, notwithstanding that the execution of them will result in producing the same messages. In this case, if else forex, it would be much more efficient to use the only one operator 'if-else' with a complex condition:. A block diagram for execution of the operator 'if-else' in program compoundcondition.
The code of the program that implements this algorithm is as follows compoundcondition. The key insight of this program solution is the use of complex condition in the operator 'if-else':. when composing the conditions of the operator 'if-else', they are widely used in the programming practice see Boolean Logical If else forex. When solving other problems, you may need to compose even more complex conditions, which makes no question, too.
Some expressions, including the nested ones, can be enclosed in parentheses.
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, time: 10:32The ELSE-IF Statement For Multiple Alternative Options - Forex Robot Expert
Formally, the syntax is as follows: if (expression) operator1. else. operator2. If the expression is true, operator1 is executed and control is given to the operator that follows operator2 (operator2 is not executed). If the expression is false, operator2 is executed. The else part of the if The full-format operator 'if-else' contains a heading that includes a condition, body 1, the key word 'else', and body 2. The bodies of the operator may consist of one or several operators; the bodies are enclosed in braces. if (Condition) // Header of the operator and condition 7/1/ · else if (Condition3 = true) // execute condition3 The else operator can be used by itself at the end of an if-else sequence to indicate a condition that will be executed by default if all of the other if operators are false
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