SNAP, Part 4 - ART of COMPUTING Week 4 Repetition...

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by Assist. Prof. M. Şükrü Kuran ART of COMPUTING Week 4: Repetition statements in snap
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Part 6: Repetition statements
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REPETITION BLOCKS Remember one of the first blocks we’ve learned, the forever block? That block allowed the execution of blocks over and over again forever. From time to time, we need a method for repeating same blocks some number of times. For these purposes, we use some special blocks called the repetition blocks. In repetition blocks, each step of execution is called an iteration . forever and repeat are the simplest repetition control blocks. Ways of Repeating Blocks Several Times
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REPEAT UNTIL BLOCK We have some cases where we want to repeat a certain set of actions UNTIL a condition occurs. Consider the following sentences: These sentence can be expressed in Snap using the repeat-until block Repeating Blocks Until Something Happens The sprite starts at some position on the stage. Move the sprite to the right until it passes beyond the stage. Ask numbers from the user and sum them up until the user gives a negative number.
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