S3 Software Design & Development

Variables & Data Types

Variables and values

A variable is a storage location in the memory of the computer. A variable is usually given a name to make it easy to refer to (meaningful variable names). Values can be stored in a variable at any time during the execution of a program.

In the example below total is the variable and 36 is the value.

Complete the quiz below to test your variable data type knowledge:

Seven Stages of the Software Development Process

Analysis – to decide on the requirements (identifying the inputs, processes and outputs for the program.
Design – create a plan for the solution (creating structured diagrams or pseudocode for the program)
Implementation – carry out the plan (Programming the task in python)
Testing – to ensure the plan works
Documentation – record the events
Evaluation – judge the success of the process
Maintenance – check it continues to do the job

How many variables are in the program:

3 - name, birthyear and username

Data Types

name = String

birthyear = String

Username = String

What lines have :

Inputs: Line 4 - name = str(input()) Line 6 birthyear = str(input())

Processes: Line 7 - username = name + birthyear

Outputs: Line 8 - "Your username is", username)

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