Sometimes, it may happen that the value passed to a switch statement block does not match any of the foreseen cases. Which case of the switch is going to be executed? None? The first one?
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- #1172
- 22 Mar 2019
Then, the default case is executed when the data evaluated by the switch block does not match any of the cases. The default case is one of all given cases and is marked with a dot:
You can change the default case by just selecting any other case as shown:
NOTE: if you delete the defaut case, the first case will become default:
A good practice is to have a case with a value that can not be met, usually -1. That case is set to default and covers any errors and unexpected data. Within the case you can put a sound block with "Error" or some other notification for the occured error.
Courses and lessons with this Tutorial
This Tutorial is used in the following courses and lessons
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The sixth level of the Robotics with LEGO curriculum for students in sixth or seventh grade.
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Robotics with LEGO - Level 3.5 - Measuring tools
The sixth level of the Robotics with LEGO curriculum for students in sixth or seventh grade.
In this level, we introduce student-created myBlocks. Any functionality that is used in several places in a program is grouped into myBlock thus shortening the program's length. Students create blocks that return the result of calculations as an output parameter. Input parameters can change the calculations in the myBlocks. The robot constructions measure physical properties like linear or rotational speed, the fuel level in a tank, or length, area and volume.
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Lesson 6 - PIN code, Access codes
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Припомнете си как се работи с условни оператори и кога се използва
Sometimes you need to evaluate the value of a sensor or some other data and depending on the value to execute one action or other. In a way we have achieved that so far, using the switch block, but we have had only two cases - if the statement is true do one thing and if the statement is false do another. However, sometimes we need more than two cases and then we use the switch block as a switch statement.
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The second level of the Robotics with LEGO curriculum for students from fifth to twelfth grades.
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