Programming techniques

Question 1

What is a sequence?

Answer 1

A series of statements that are executed one afte ranother

Question 2

What is Selection?

Answer 2

Where a decesion is made based on the state of a boolan expression

Question 3

What is iteration?

Answer 3

Iteratin mean repition. It is used to make a section of code repeat itself
for i in range(0,3):
print(i)

Question 4

What is recursion?

Answer 4

This is where a procedure or function calls itself. It is another way of producing iteration. recursion will call a stack overflow error if a terminating condition is not built in.
def recuse (number):
        print(number)
        recurse(number)

Question 5

What is a global variable?

Answer 5

Can be seen throughout a program. They are declared or set outside any function or subprograms
Global variables can be dangerous .it is easy to overlook when they are changed

Question 6

What is a local variable?

Answer 6

Local variables are set or declared inside a function or other subprogram, they can only be accessed from within that subprogram

Question 7

What are functions?

Answer 7

A subroutine retrun a value

Question 8

What are procedures

Answer 8

Perform some opeartios but do not return a value

Question 9

What is passing by reference?

Answer 9

Parameters can be passed by reference. this means that the address of the variable is passed to the subprogram

Question 10

Features of IDE?

Answer 10

BREAKPOINT- this will cause the program to stop on the line so that you can see where it reaches that line
WATCH-set a watch on a variable so that its value is displayed each time it changes
STEP THROUGH-you can step through a program line at a time so that you can see what is happening

Question 11

What is passing by value?

Answer 11

If a parameter is passed by value, its actual value is passed to the subroutine, where it is treated as a local variable. changing a parameter inside the subroutine will not affect its value outside the subroutine