2.2 Programming Fundamentals

Question 1

What is 7 DIV 2?

Answer 1

3 - DIV means integer division in computer science.

Question 2

What must happen before this line of code will execute? X = f.readLine()

Answer 2

f must be a pointer to an open file

Question 3

What is the purpose of the WHERE structure in SQL?

Answer 3

to define the criteria of the records returned

Question 4

how to convert a string into uppercase

Answer 4

string.upper()

Question 5

how to find the length of a string

Answer 5

len(string)

Question 6

how to return a number of characters from the beginning of the string

Answer 6

string[ : num ]

Question 7

how to return a number of characters from the end of the string

Answer 7

string[ - num : ]

Question 8

how to extract characters from the middle of a string

Answer 8

string[ w : z ]

starting from w, up until (not including) z

Question 9

how to find the position of a string inside a string

Answer 9

string.find(“z”)

where z is the substring. if it is a character, the number of its position is given. if it is a string the position of the first letter is given

Question 10

how to produce a random number

Question 11

how to open a file

Answer 11

Question 12

how to read from a file

Answer 12

x = filename.read()
contents of file is copied into x

Question 13

how to write to a file

Answer 13

filename.write(“data to write”)

(filename is not the name of the file but the variable in the code that the file is stored in)

Question 14

how to close a file

Answer 14

filename.close()

(filename is not the name of the file but the variable in the code that the file is stored in)

Question 15

how to add an item to an “array”

Answer 15

array.append(item)

Question 16

how to call an item from an “array”

Answer 16

array[index]

Question 17

how to insert an item to an “array” at position index

Answer 17

array.insert(index,item)

Question 18

how to remove an item from an “array”

Answer 18

array.remove(item)

Question 19

how to remove an item stored at a particular index in an “array”

Answer 19

array.pop(index)

Question 20

how to sort items in an “array”

Answer 20

array.sort()

Question 21

how to add an array to “array”

Answer 21

array.extend(array2)

Question 22

how to reverse the order of a list

Answer 22

array.reverse()

Question 23

how to delete all items from “array”

Answer 23

del array[:]

Question 24

how to find if a particular item is in an array

Answer 24

if item in array:

Question 25

how to read a line from a file

Answer 25

filename.readline()

(filename is the the name of the file but the variable in the code that the file is stored in)

if you want to read a specific line you can create a loop that repeats for the same number of times as the line you want

Question 26

how do you code for when you expect a code could crash

Answer 26

try:
jlajk
except:
aslka

try is the keyword for just before the code you think will crash and except is what path the code will follow if it does crash

Question 27

how to do a validation check for a number

Answer 27

while inputs.isnumeric() == False:
inputs = input(“enter a num”)

Question 28

how to turn a letter into its ascii code number

Answer 28

ord(letter)

Question 29

how to turn a number into its ascii corresponding letter

Answer 29

chr(number)