Lecture 5

Question 0

Values:

1. What are values?
2. Why are values important for programming?

Answer 0

1. ~data
   ~ could be real number, integer, or character
   ~ things you have been storing in your variable
2. ~programs ultimately have to interact with some sort of value
   ~ values are important to humans
   ~ processing values (data) are what makes programs important

Question 1

Addresses:

1. What are addresses?
2. Why are addresses important for programming?

Answer 1

1. ~Location for computer memory.
   ~ It’s an overly simplified explanation but that’s all you need to know.
2. ~The C programming language allows the programmer the flexibility to manage memory
   ~ Having a high level of control over memory allows C programming to be more efficient and take up less memory

Question 2

Addresses vs Values:
1.
2.

Answer 2

1.

2.

Question 3

Reference and Dereference Operators:

1. Reference operator |&|
2. De-reference operator |*|
3. Pointers

Answer 3

1. |&value_variable| ~ “address of” value_variable
2. |*pointer_variable| ~ “value pointed but” pointer_variable
3. ~ int *pointer_variable : declare pointer_variable as a pointer to an object of type int
   ~ in programming, variables can store integers, real numbers, characters, or addresses
   ~ pointers are variables that store an address
   ~ pointers are usually used in conjunction with the de-reference operator *
   ~ pointers are just variables used in a specific way