RULES FOR VARIABILES NAME

                                            RULES FOR VARIABILES NAME

1) variable name must start with a letter or the underscore character

2 ) variable name cannot start with a number

3 ) variable name can only contain alpha-numeric characters 

and underscores (A-z, 0-9, and _ ){(@=5)its Error}

4)Variable names are case-sensitive  

(eg):-

(age, Age and AGE are three different variables)