Page 86 - Computer Genius Class 05
P. 86

All the numbers, text, date or pictures that we use in a program are called data. We store
                  this data in the computer memory so that  e can get in ormation  rom it later. This data
                  is stored in variables.  t is called  aria le  ecause it does not ha e a fixed  alue  its  alue
                  changes. For example, in the move block, the variable has a value 10 by default. You can
                  modify this value according to your script.
                  Types of Variables

                  There are t o types o   aria les. They are as  ollo s

                  Global Variables

                     a  aria le is created to  e used and modified  y all the sprites  then it is  no n as a glo al
                  variable. A Global variable can be created on any sprite but its value can be accessed or
                  modified  y other sprites used in the pro ect.

                  Local Variables
                     a  aria le is created to  e used and modified  y a single sprite only  then it is  no n as a local
                   aria le.  ocal  aria les can only  e accessed or modified  rom the sprite  here it  as created.

                  Creating Variables in Scratch

                  To create  aria les in  cratch   ollo  the gi en steps


                                             2  Click on  Make  a Variable   loc .  Type  a
                                             variable name in the New variable name box.






















                       1  Click on  Variables
                      block category.






                                             3  Click on the radio button of either of the     4  Click OK button.
                                            options. Click on For all sprites if you want
                                            this variable to appear for all the sprites.


                  The  aria le appears in the list o  Variables blocks. Observe that the variable name fruit
                  appears in all the blocks. Now create the following script.


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