Algorithms

Below is a series of different programs that have pseudocode and flowcharts completed for them. Use them to try and relate your algorithm designs to your code.

Click here to view the pseudocode code guide.

Click here to view the different flowchart symbols.

Example 1 - Teddy Bears Program - Sequencing

Python

hours = int(input("Enter the number of hours worked: "))
bears = int(input("Enter the number of teddy bears made: "))
hourswage = hours * 7
bearswage = bears * 0.45
total = hourswage + bearswage
print("Your total wage is: £{:.2f}".format(total))
Pseudocode
Flowchart

Example 2 - Water Temperature Program - Selection

Python

fahrenheit = float(input("Enter the temperature of the water in fahrenheit: "))
centigrade = (fahrenheit – 32) * (5/9)
if centigrade <= 0:
    print("Water Frozen")
elif centigrade >=100:
    print("Water Boiling")
else:
    print("Water is neither frozen or boiling")
Pseudocode
Flowchart

Example 3 - Average Calculator - Iteration (FOR)

Python

total = 0
numbers = int(input("How many numbers do you want to enter? "))
for x in range(numbers):
    latest = int(input("Enter a number: "))
    total = total + latest
average = total / numbers
print("The total of the numbers was " + str(total))
print("The average of the numbers was " + str(average))
Pseudocode
Flowchart

Example 4 - Menu Selection - Iteration (WHILE)

Python

print("What would you like to do?")
print("1. Play Game")
print("2. Instructions")
print("3. Quit")
valid = False
while valid==False:
    option = int(input("Enter which option you want: "))
    if option == 1 or option == 2 or option == 3:
        valid=True
print("Let's go")
Pseudocode
Flowchart

Example 5 - Login System - Reading from a File

Python

username = input("Please enter your username (email address): ")
password = input("Please enter your password: ")
file=open("Logins.csv","r")
found = False
for line in file:
    details=line.split(",")
    if details[0] == username and details[1] == password:
        found = True
        print("Email: " + details[0])
        print("Name: " + details[2] + " " + details[3])
        print("Address:\n" +details[4] +"\n"+details[5]+"\n"+details[6])
if found == False:
    print("Incorrect login details entered")
Pseudocode
Flowchart

Example 6 - Product Catalogue - Writing to a File

Python

another = "Y"
while another == "Y":
    barcode = input("Enter an 8 digit barcode: ")
    description = input("Enter a product description: ")
    price = input("Enter a price: ")
    file=open("Products.csv","a")
    file.write(barcode + "," + description + "," + price)
    file.close()
    print("Product added to catalogue")
    another = input("Do you want to add another? Y/N ")
Pseudocode
Flowchart

Example 7 - Measurement Conversion - Functions

Python

def mtokm(value):
   answer = value*1.6
   return answer

def kmtom(value):
   answer = value*0.62
   return answer

print("What conversion would you like to do?")
print("1. Convert Miles to Kilometres")
print("2. Convert Kilometres to Miles")
option = input(">>")
print()
number = float(input("Enter your measurement to convert: "))
if option=="1":
   print(str(number) + " miles in KM is " + str(mtokm(number)))
elif option=="2":
   print(str(number) + " KM in miles is " + str(kmtom(number)))
else:
   print("Please enter a valid selection")
Pseudocode
Flowchart