Question

1. Separate valid and invalid variables:

Answer 1

Firstly we explain the variable and the declaration rule for the variable and further separating the valid and invalid variables.

• Whenever a user is given a question, variables are data values that can vary. for example  age, CSL, etc.
• It may alter and during the execution of the program.
• It's a storage space for memories.
• It has a name that corresponds to the location.
• Data is stored in the memory location.

The rule for variable declaration:

• The names of your variables should be based on the phrases used in the subject area, and they should reflect the variable's function.
• By removing spaces between the words, you can make variable names. Each word in the name should be capitalized, including prepositions and pronouns that are one letter long.
• An underscore should never be used to start a variable name.
• Single-character variable names should be avoided. For loop counters, only short variable names are permitted.
• After the state that equals the "true" value, name variables that describe binary states ("true" or "false").

The valid variable is:

CSL, Age,CLS,SEE,Stop5for,Give, $shopping, and United.

The invalid variable is:

Mark-sheet, Tel $, Simple Interest, and 545Newton.

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