Which of the following is not a valid C variable name?

• int number;

• float rate;

• int variable_count;

• int $main;

All keywords in C are in ____________

• LowerCase letters

• UpperCase letters

• CamelCase letters

• None of the mentioned

Which of the following is true for variable names in C?

• They can contain alphanumeric characters as well as special characters

• It is not an error to declare a variable to be one of the keywords(like goto, static)

• Variable names cannot start with a digit

• Variable can be of any length

Which of the following is not a logical operator?

• &&

• !

• ||

• |

How many keywords are there in C language?

• 30

• 31

• 32

• 33

6. Which of the following cannot be a variable name in C?

• volatile

• true

• friend

• export

Which keyword is used to prevent any changes in the variable within a C program?

• immutable

• mutable

• const

• volatile

What is the result of logical or relational expression in C?

• True or False

• 0 or 1

• 0 if an expression is false and any positive number if an expression is true

• None of the mentioned

What is #include <stdio.h>?

• Preprocessor directive

• Inclusion directive

• File inclusion directive

• None of the mentioned

Which of the following are C preprocessors?

• #ifdef

• #define

• #endif

• all of the mentioned