Question

Check if the following identifiers are valid: 1. c 2. cat 3. n1m1 4. short1 5. _hello, 6. 42c, 7. hi there, 8. cat!

Answer 1

Only option 6 and 7 are not valid but the option 1,2,3,4,5 and 8 are valid.

Step-by-step explanation:

Identifier means the name which is defined for any programming language. There is a need for a variable in any programming language which is used to store the value to perform the calculation with the help of instruction.There are 2 rules which state that how a user can define an identifier. They are as follows--

1. The identifier name must not start with any number.
2. The identifier name can not hold the special symbol except underscore(_) either in start point or any other place.

The above question wants to know that which option is valid or not which are as follows--

• Option 6 and 7 are not valid because the identifier of option 6 starts with number and the identifier of option 7 hold space.
• Option 1,2,3,4,5 and 8 are valid because the identifier of these options has not neglected the rule to declare the identifier which is defined above.