A variable is a data object whose value can be changed at runtime. To declare a variable, you use the data keyword with the following syntax:
data variable_name type data_type.
Following the data keyword is the variable name. The variable name must follow the these rules:
It cannot exceed 30 characters in length.
It starts with a letter, and can have Roman letters, digits, and underscores.
After the variable name is the type keyword followed by the data type of the variable.
Variables has two types static variable and reference varaibles.
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