Event driven programming is a style of programming where the flow of the program is determined by user actions (mouse clicks, key presses) or messages from other programs. In contrast, in batch programming the flow is determined by the programmer. Batch programming is the style taught in beginning programming classes while event driven programming is what is needed in any interactive program. Event driven programs can be written in any language a...
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Event driven programming is a style of programming where the flow of the program is determined by user actions (mouse clicks, key presses) or messages from other programs. In contrast, in batch programming the flow is determined by the programmer. Batch programming is the style taught in beginning programming classes while event driven programming is what is needed in any interactive program. Event driven programs can be written in any language although the task is easier in some languages than in others. Some programming environment make the task quite easy, others less so.
Here are two pseudocode versions of a trivial program to add two numbers:
Batch version
Event driven version
At first sight, the event driven program seems more cumbersome and for such a trivial task is indeed so. However, the second program can be made generalized far more easily than the first. Instead of checking just for a number entry we may add code to check whether any of several events has occurred...
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