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Building IoT Applications (Chapter-4) M4-R5.1
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Variables

          A variable is a name of memory location. It is used to store data. Variables are changeable, we can change value of a variable during execution of a program. . It can be reused many times.

 Note: Variable are nothing but identifiers.

Rules to write variable names:

i. A variable name contains maximum of 30 characters/ Variable name must be upto 8 characters.

ii. A variable name includes alphabets and numbers, but it must start with an alphabet.

iii. It cannot accept any special characters, blank spaces except under score( _ ).

iv. It should not be a reserved word.

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