modular programming

Question 1

decomposition

Answer 1

break down large problem into smaller problems.

break down a large program into sub- procedures (modules)

Question 2

procedures

Answer 2

do not return a value

Question 3

functions

Answer 3

do return a value

Question 4

advantages of decomposition/ modular programming

Answer 4

• each small prob is easier to solve
• can share programming among a team
• program more readable
• modules are re- usable

Question 5

how modules are held in memory

Answer 5

a new area of memory opens while the module runs and closes when it finishes running

Question 6

local variables

Answer 6

can only be used inside the module

lost when the module closes

Question 7

global variables

Answer 7

can be used anywhere in the program

changes to them are permenant

Question 8

parameters

Answer 8

values passed from main prog to module

are used like variables in the module

Question 9

returned values

Answer 9

when function stops a single value can be returned to the main program.

it must be captured or it will be lost.

Question 10

parameter passed by value

Answer 10

module gets a copy of the value, and it does not change the values in the main program

Question 11

parameter passed by reference

Answer 11

the module gets access to the original variable’s memory location. therefore it can change values used in the main program without using return.