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    Sensing Blocks

                      Sensing blocks in Scratch sense the input from the keyboard or the mouse at the time
                      of execution of a script. Some of the sensing blocks and their functions are given below:

                                                         block  prompts  the  user  to  type  the  input  using  the

                        keyboard. It waits for the user input. No other block runs at that time.

                                                       block  checks  if  the  Sprite  touches  the  mouse-pointer,
                        another Sprite or the edge. If the answer is true, then it executes the blocks given after

                        it in the condition. If false, then it executes other blocks as per the given condition.

                                               block checks if the Sprite is touching the colour chosen in the

                        block. If true, then it executes a set of blocks, else executes another set of blocks.

                                                       The  block  checks  if  the  first  chosen  colour  is  touching

                        the second chosen colour. If true, then it executes a set of blocks, else executes

                        another set of blocks.

                                                     block  checks  if  the chosen key  is  pressed  by  the user. If

                        true, then it executes a set of blocks, else executes another set of blocks.

                      Let us create a small script to understand the working of sensing blocks.

                      Sensing an Input

                      To add sensing blocks to the script, follow the given steps:

                        1  Click on the Sensing
                       blocks category in tabs.

                        2  Insert a Sprite,
                       Penguin 2 on the
                       stage. Delete the cat
                       Sprite.

                           74    Premium Edition-V

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