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N5 – Input Validation

Today we looked at the following problem

Write a program which will allow a user to input only a number in the range 0-100. An error message will be output if the number is invalid.

The program will output a message when the number input is valid (after the loop for checking the number).

We then worked through Analysis, Design, Implementation and Testing of the program.

Analysis

Input – a number

Process – check number is between 0 and 100

Output – a message about the numbers validity

Design

We looked at all three design methodologies and created designs in our jotter.

Pseudocode

  1. Declare Integer Number
  2. Get Number from user
  3. While Number < 0 OR Number > 100
  4.     Display “Sorry that number is not valid”
  5.     Get number from user
  6. End While
  7. Display “That is a valid number”

Flowchart

Structure Diagram

Implementation in Python


number=0 # declare number as type integer
number = int(input("Please enter a number from 0 - 100 "))
while number < 0 or number > 100:
    print("Sorry that number is not valid")
    number = int(input("Please enter a number from 0 - 100 "))
print("That is a valid number")

Testing

We tested the code with Normal, Extreme and Exceptional test data.

BGE – HTML Links

The anchor tag <a></a> in html 5 is used to create a hyperlink between two documents. The <a></a> surrounds text or an image that then is used to activate the link stored in the href attribute.


<!doctype html>
<html>
<head>
<title> Page 1 </title>
</head>
<body>
<h1>Page 1</h1>
<p>
This is a <a href="page2.html">link</a> to page 2
</p>
</body>
</html>

In the example above the word link is linked to page2.html.

N5 – Arrays (revision)

To read and write information to an array in Python we must first create the arrays, lines 4&5 do this for us.

The for loops on lines 8,12 & 17 are used to process each of the arrays in turn

  • The for block for line 8 and 9 gets the 10 subjects and stores them in the subjects array.
  • The for block on line 12 and 13 displays each subject name and stores the marks for that subject.
  • Finally lines 16-20 display the information from each array in one table.
# get and display 10 subjects and marks

# create two arrays to store the information
subjects=[""]*10
marks =[0]*10

#Get all the subjects
for index in range(10):
    subjects[index]=input("What is the name of subject" + str(index+1))

#Get all the marks
for index in range(10):
    marks[index]=int(input("What is the mark for " + subjects[index]))

#display subjects and marks
print("-"*25) # Pretty divider
for index in range(10):
    print(subjects[index],"\t",marks[index])

print("-"*25)

Read more

Test Post – Python Code

Using <pre />

print("Please enter your name")
name = input()
if name == "Bob":
    print("Hello " + name)
else:
    print("Sorry only bob allowed " + name)

Using Plugin :)

print("Please enter your name")
name = input()
if name == "Bob":
    print("Hello " + name)
else:
    print("Sorry only bob allowed " + name)

What line contains the conditional statement? You can see the answer below.

print("Please enter your name")
name = input()
if name == "Bob":
    print("Hello " + name)
else:
    print("Sorry only bob allowed " + name)