C Basics

Question 1

main()

Answer 1

Identity of the start of the program, with every C program having a main().
main is a C keyword, and should not be used for any other variable.

Question 2

Statements

Answer 2

A specification of an action to be taken by the machine as the program executes, with each one ending with a semicolon.

Question 3

Identifiers

Answer 3

Words used to represent certain program entities.
Example include:
int my_int;
Void CalulateArea (int radius)
The first one represents a program variable, the second represents a function name.

Question 4

Rule for identifiers

Answer 4

• can contain mix of characters and numbers
• cannot start with number
• must start with letter or underscore
• cannot contain arithmetic operations
• cannot contain a space
• cannot be any other punctuation marks
• cannot be reserved keywords
• case sensitive

Question 5

Integers

Answer 5

Positive and negative whole numbers.
int i = 1;

Question 6

Unsigned Integers

Answer 6

Positive whole numbers.

Question 7

Floating Point Numbers

Answer 7

Real numbers.

Question 8

Chars

Answer 8

Letters in English.

Question 9

Constants

Answer 9

Fixed values.
const a = 1;