Write a short note on variables.

1.	Write a short note on variables.
Answer» “A variable is a temporary container to store information, it is a named location in computer memory where varying data, like numbers and characters, can be stored and manipulated during the execution of the program”. A variable must be declared before it is used. For example, int my_age; A few naming conventions must be taken in consideration. 1. It must start with an english alphabet character, either lowercase or uppercase, including underscore (not a hyphen). It may not start with a digit. The rest is optional. It can either be a letter or a digit (0-9). 2. C++ keywords like main, case, class, if, else, do, while, for, tyedef, etc cannot be used as a variable names. 3. It must be unique within the scope.

Answer»

“A variable is a temporary container to store information, it is a named location in computer memory where varying data, like numbers and characters, can be stored and manipulated during the execution of the program”.

A variable must be declared before it is used. For example, int my_age; A few naming conventions must be taken in consideration.

1. It must start with an english alphabet character, either lowercase or uppercase, including underscore (not a hyphen). It may not start with a digit. The rest is optional. It can either be a letter or a digit (0-9).

2. C++ keywords like main, case, class, if, else, do, while, for, tyedef, etc cannot be used as a variable names.

3. It must be unique within the scope.

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