4. Sequence

Sequence is one of the three basic control structures.

A sequence is a control structure that consists of a set of instructions like a recipe.

Every line of code in the sequence is run in the order that it is written.

Pseudocode typically starts with BEGIN and ends with END.

Python - Pseudocode equivalents

Python	Pseudocode
=	←
print	OUTPUT or PRINT or DISPLAY
input	INPUT or GET

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4.1. Input and output

The code below prompts the user to enter their name, then prints a greeting.

name = input("Enter your name?")
print("Hello, " + name + ". Nice to meet you.")

Pseudocode. The equivalent pseudocode is:

BEGIN
   name ← INPUT ("Enter your name?")
   PRINT "Hello, " + name + ". Nice to meet you."
END

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Tasks

1. Write pseudocode for the python sequence below:

   a = 5
   b = 6
   print(a * b)
   

Q1

Write pseudocode for the python sequence.

a ← 5
b ← 6
OUTPUT (a * b)

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Tasks

1. Write python for the pseudocode sequence below. Hint: random.sample(string, k) returns a random list of k characters from the string without replacement.

   BEGIN
      INPUT a number between 1 and 10
      Multiply by 3
      Add 18
      Multiply by 3
      OUTPUT all the digits but 1
   END
   

Q1

Write python for the pseudocode sequence.

import random

n = int(input("Enter a number between 1 and 10: "))
n = n * 3
n = n + 18
n = n * 3
n = str(n)
mixed_digits_list = random.sample(n, len(n) - 1)
digits_str = "".join(mixed_digits_list)
print(digits_str)