If you want to show control structures like this, you are better off with an activity diagram or indeed with code itself. A UML Sequence diagram shows how messages go back and forth between objects over time. But how do we illustrate an 'if this, then that' scenario in a sequence diagram Enter the alt fragment. The same need to represent decision-making processes arises in sequence diagrams. The first thing to point out is that this isn’t what sequence diagrams are good at. Conditionals in Sequence Diagrams When coding, conditional logic is instrumental in controlling the flow of execution. The objects involved in the operation are listed from left to right according to when. A common issue with sequence diagrams is how to show looping and conditional behavior. The time progresses as you go down the page. They can be human users, external hardware, or other subjects. Actors interact with the subject by exchanging signals and data. Notation Description: An actor represents a type of role played by an entity external to the subject. Sequence diagrams are organized according to time. The answer here is quite simple: Replace the value of the Success guard (as seen in diagram above) with a1 & b3 References: How to show if condition on a sequence diagram. Here are key elements and concepts within a UML Sequence Diagram: 1. Eventually, if none of the if statements are true, the last else clause is performed. Sequence Diagram is an interaction diagram that details how operations are carried out - what messages are sent and when. The program logic from the above example sequentially compares the input number from the console with the digits from 1 to 9, when each following comparison is being performed only in case the previous comparison is not true. We can read the digit and then, through a sequence of conditions we print the relevant English word: int num = int.Parse(Console.ReadLine()) Print the digits in the range of 1 to 9 (digits are read from the console) in English. Watch the video lesson about the if-else checks. For this purpose, we use the following “chained if-else” format: if (condition) In such cases, we can apply the construction if-else if. Sometimes we need to do a sequence of conditions before we decide what actions our program will execute.
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