Which of the following is true for variable names in C?a.They can contain alphanumeric characters as well as special charactersb.It is not an error to declare a variable to be one of the keywords(like goto, static)c.Variable names cannot start with a digitd.Variable can be of any length
Question
Which of the following is true for variable names in C?a.They can contain alphanumeric characters as well as special charactersb.It is not an error to declare a variable to be one of the keywords(like goto, static)c.Variable names cannot start with a digitd.Variable can be of any length
Solution 1
The correct answer is c. Variable names cannot start with a digit.
Here's why:
a. They can contain alphanumeric characters as well as special characters - This is partially true. Variable names in C can contain alphanumeric characters (both uppercase and lowercase) and the underscore character (_). However, they cannot contain special characters like @, #, $, %, etc.
b. It is not an error to declare a variable to be one of the keywords(like goto, static) - This is false. In C, keywords like "goto", "static", "for", "while", etc. are reserved. You cannot use them as variable names.
c. Variable names cannot start with a digit - This is true. In C, variable names must start with a letter or an underscore. They cannot start with a digit.
d. Variable can be of any length - This is false. There is a limit on the length of variable names in C. The exact limit can vary between different compilers, but it's typically around 31 characters.
Solution 2
The correct answer is c. Variable names cannot start with a digit.
Here's why:
a. They can contain alphanumeric characters as well as special characters - This is partially true. Variable names in C can contain alphanumeric characters (both uppercase and lowercase) and the underscore character (_). However, they cannot contain special characters like @, #, $, %, etc.
b. It is not an error to declare a variable to be one of the keywords(like goto, static) - This is false. In C, keywords are reserved words that have special meanings. You cannot use them as variable names.
c. Variable names cannot start with a digit - This is true. In C, variable names must start with a letter or an underscore.
d. Variable can be of any length - This is false. The length of a variable name does not have a limit in the C standard, but most C compilers (like GCC) have a limit of 31 characters for variable names.
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