Lecture 1

Question 1

What are variables?

Answer 1

Variables hold data. They represent storage in memory (size + location)

Question 2

3 Steps of creating a variable

Answer 2

Declaration: Introduce the variable name and type
Definition: Reserve space in memory
Initialisation: Assign a known value (e.g. number)

Question 3

What is the arithmetic type and the number of bits of the following data types:
-char
-short
-int
-float
-double

Answer 3

char = integer & 8 bits

short = integer & 16 bits

int = integer & 16 or 32 bits

float = Real number & 32 bits

double = Real number & 64 bits

Question 4

Implicit vs Explicit casting?

Answer 4

Implicit:
uint8_t = 22;
uint16_t b = a

Explicit:
float c = 3.5;
uint8_t = (uint8_t) c;

*Defining the data type of the cast variable

Question 5

What are these arithmetic operators?
+, -, *, /, %

Answer 5

+ = addition
- = subtraction
* = multiplication
/ = division
% = modulus

Question 6

What are these assignment operators?
=, +, -, *, /, %

Answer 6

= Assignment
+= Addition assignment
-= Subtraction assignment
*= multiplication assignment
/= division assignment
%= Modulo assignment
a++ post increment (be

Question 7

What are the shift operators equivalent to?

Answer 7

Left shift is equal to multiplying by 2

Right shift is equal to dividing by 2