1. The Software Development Process

• Running programs created by others is relatively simple

• The hard part is starting to create your own programs

• Computers are very strict and there are many details

• So it is necessary to be very systematic

1.1. Steps in the Software Development Process

• Analyze the problem:

  • Understand exactly what is the problem to solve?

  • Well-defined problem, halfway solved problem.

• Specification of what the program will do:

  • Describe exactly what your program will do.

  • At this stage, I shouldn’t worry about how I’m going to make my program? but more decide exactly what it will do?

  • What are the inputs and outputs of the program?

• Design the program:

  • Formulate the general structure of the program.

  • We can use pseudocode at this step.

• Implement the program:

  • Design some tests to validate your program.

  • Translate the project to any programming language.

  • In this course we will use Python.

1.2. Example: Fahrenheit to Celsius temperature converter

• Problem analysis:

  • Given a temperature in Fahrenheit, obtain the conversion in Celsius.

• Specification of what the program will do:

  • Input: temperature in Fahrenheit

  • Output: temperature in degrees Celsius

  • Output: 5 * (F-32) / 9

• Design of how the program will work:

  • Read the value of temperature in Fahrenheit.

  • Convert the value using the formula 5 * (F-32) / 9

  • Print the converted value.

• Implementation of the problem:

  • Tests: 32F = 0C and 100F = 37.8C

F = float(input("Fahrenheit: ")) C = 5 * (F - 32) / 9 print("Celsius: %2.1f" % C)

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