Identify the invalid C constants and variable names, and determine if the statements about the C language are true or false.
Understand the Problem
The image contains questions about C programming language. Specifically, it asks to identify invalid constants and variable names in C, and to determine whether certain statements about C are true or false.
Answer
[A] Invalid constants:'3.15', 35,550, 'eLearning', 2^3. [B] Invalid variables: B'day, int, $hello, #HASH, total%, 1st, stack-queue, %name%. [C] (a) True, (b) True.
[A] Invalid C constants: '3.15' (floating-point constant should not be enclosed in single quotes), 35,550 (commas are not allowed in numeric constants), 'eLearning' (string should be enclosed in double quotes), 2^3 (^ is a bitwise XOR operator, not exponentiation). [B] Invalid variable names: B'day (contains an apostrophe), int (reserved keyword), $hello (starts with a special character), #HASH (starts with a special character), total% (contains a special character), 1st (starts with a digit), stack-queue (contains a hyphen), %name% (contains a special character). [C] (a) True, (b) True.
Answer for screen readers
[A] Invalid C constants: '3.15' (floating-point constant should not be enclosed in single quotes), 35,550 (commas are not allowed in numeric constants), 'eLearning' (string should be enclosed in double quotes), 2^3 (^ is a bitwise XOR operator, not exponentiation). [B] Invalid variable names: B'day (contains an apostrophe), int (reserved keyword), $hello (starts with a special character), #HASH (starts with a special character), total% (contains a special character), 1st (starts with a digit), stack-queue (contains a hyphen), %name% (contains a special character). [C] (a) True, (b) True.
More Information
In C, constants are fixed values that cannot be changed during the program's execution. Variable names (identifiers) must adhere to specific rules, such as starting with a letter or underscore and containing only letters, digits, or underscores.
Tips
A common mistake is using special characters or starting variable names with digits. Also, keywords cannot be used as variable names.
Sources
- What is valid and invalid c variable names? - Quora - quora.com
- valid and invalid variable names in c - Log2Base2 - log2base2.com
- C Identifiers - GeeksforGeeks - geeksforgeeks.org
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