C Programming Variables and Data Types

What is the difference between a variable and a constant in C programming?

• A variable is always initialized with a value, while a constant is not.

• A variable can change its value during program execution, whereas a constant remains constant and cannot be modified.

• A variable can be used in any function, while a constant is limited to the main function.

• A variable can only store integers, while a constant can store any data type.

Explain the concept of data types in C programming.

• Data types in C have no specific size or range of values.

• Data types in C include int, float, char, double, etc., each with specific size and range of values they can store.

• Data types in C are only limited to int and float.

• Data types in C are interchangeable without any restrictions.

What are the basic data types available in C programming?

• boolean

• string

• array

• int, float, char, double, void

How do you declare a variable in C programming?

• double num;

• char letter;

• int num;

• float value;

What is the size of the 'int' data type in C programming?

• 4 bytes

• 2 bytes

• 8 bytes

• 16 bytes

What is the 'char' data type used for in C programming?

• It is used to define functions.

• It is used to store a single character.

• It is used to perform mathematical operations.

• It is used to store multiple characters.

Explain the difference between 'float' and 'double' data types in C programming.

• The 'float' data type has less precision and occupies less memory compared to the 'double' data type in C programming.

• The 'float' data type is used for integers while 'double' is used for floating-point numbers.

• The 'float' data type is limited to smaller values than the 'double' data type.

• The 'float' data type is faster in execution than the 'double' data type.

How do you initialize a variable in C programming?

• int x; x = 5;

• int x == 5;

• int x = 5;

• int x = 5.0;

What is the 'void' data type used for in C programming?

• To declare a variable without a specific type

• To define a constant value

• To represent a character data type

• To indicate that a function does not return any value.

What are the rules for naming variables in C programming?

• Variable names in C programming must follow specific rules such as using only letters, digits, and underscores, starting with a letter or underscore, being case-sensitive, and not being a keyword or reserved word.

• Variable names in C programming do not need to be case-sensitive

• Variable names in C programming can start with a number

• Variable names in C programming can contain special characters such as @, #, and $