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The three relational operators are:





                                                             greater than





                 Similarly, you can use the other blocks to perform less than                           and equals

                 to               .


                 Logical Operators

                 Using logical operators,  you can combine two or more relational operators  to
                 produce a single true/false result. These blocks allow you to further refine your

                 comparison of values.

                                                    The result is true only if the two expressions are true


                                                    The result is true only if either of the expressions is true


                                                    The result is true only if the expressions are false



                     VARIABLES

                 Variables are used to hold values. These are the data values for which the value
                 can be changed when the code is being processed. In Scratch, the variables can be

                 created using Data blocks. To create a variable, follow these
                 steps:

                 Step 1  Click on Data category of blocks.

                 Step 2  Click on the Make a Variable button to open the
                          New Variable dialog box.




                                           Step 3  Type a suitable name, for example N1 for the variable
                                                    in the Variable name: text box.


                                           Step 4  Select an option specifying whether the variable is to
                                                    be created For all sprites or For this sprite only.


                                           Step 5  Click on the OK button.





                                                                                       Advanced Blocks in Scratch  57
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