CS Paper 1

Question 1

string manipulation -length

Answer 1

-length of string =
len(string)
spaces are a valid character

Question 2

string manipulation-position

Answer 2

• stringname>.index(string)
  -stringname>.find(string)

Question 3

string manipulation - substring

Answer 3

-string[start:end]

Question 4

string manipulation - concatenation

Answer 4

cocatenation - act of joining two/more separate strings

Question 5

string manipulation - character-character code

Answer 5

supply ord function. ‘a’ returns ASCII coe 97

Question 6

string manipulation - character code to character

Answer 6

supply the chr function, ‘97’ returns ASCII character ‘a’

Question 7

string maniupulation commands

Question 8

random number generator

Answer 8

-import random
print (random.randint(1,6))

Question 9

exception handling

Answer 9

-process in programming that responds to the occurrence of exceptions(error) during the execution of a program
-goal is to provide a way to detect and report error occurences so that appropriate action can be taken

Question 10

exception handling -solution

Answer 10

-try clause and jump to except clause when there is an error instead of crashing

Question 11

subroutines

Answer 11

-block of code given an identifiable name within a program
-use them to break down a larger problem into series of smaller, more manageable problems so they are easier to: code, debug,reuse

Question 12

procedures

Answer 12

block of code
that takes in 0,1/more parameters
performs a set task

Question 13

function

Answer 13

block of code
takes in 0/1/more parameters
performs a set task
returns a value

Question 14

advantages of subroutines

Answer 14

-Programs easier to write
-Programs easier to debug
-Creates reusable components
-Functions can be grouped in a Library for easy reuse across multiple programs

Question 15

local variables

Answer 15

-Declared inside a Subroutine
-Only accessible by that subroutine
-Created when subroutine is called
-Destroy destroyed when subroutine ends

Question 16

global variable

Answer 16

-Declared at the top of a program outside of subroutines
-Accessible throughout program
-Created when program starts
-Destroy destroyed when program ends