SDD

• analysis


  determine what the program will do.
• design


  determine the structure of program
• implementation


  writing the program
• testing


  see if the program works as intended
• evaluation


  review the program based on

  • readability
  • robustness
  • efficiency
  • fit for purpose
• iterative software development process

  the software development process is iterative because because stages can be revisited e.g. after testing the process may return to the implementation stage to fix any programming errors, or the design stage to fix any design errors.
• analysis functional requirements

  • inputs
  • process
  • outputs
• what is the process

  transforms any data from inputs into output information
• characters


  singular letters - ‘a’ ‘b’ ‘c’
• strings


  multiple letters together - ‘skibidi’, ‘toilet’
• integer


  numbers - 1, 100
• real


  not a full integer - 1.23
• boolean 


  true or false
• 1D arrays


  allows programmers to store data in a list
• structure diagrams


  graphically show the steps needed to solve a problem and must be read from 1-6
• structure diagram example

  
• flowcharts


  designing the steps of a program graphically
• flowcharts example

  
• pseudocode 


  designing the steps of a program using phrases that resemble lines of program code
• pseudocode example

  
• assignment


  sets the value of a variable
• arithmetic operators

  • + = addition
  • - = subtraction
  • * = multiplication
  • / = division
• string concatenation


  joining two or more strings together
• logical operators

  • AND
  • OR
  • NOT
• and


  the condition will be true if both statements are true
• or


  the condition will be true if either one, or both of the statements are true
• not


  reverses the result
• fixed loop


  always execute a fixed number of times
• conditional loop


  execute while a specific condition is being met, or until a specific condition is met
• random function


  returns a random number between two parameters.
• round function


  returns a decimal number rounded to a given number of places.
• length function


   returns the length of a string.
• input validation


  checks that the user input is acceptable.
• running total


  adds a list of values.
• traversing an array


  accesses each element from an array
• syntax errors


  errors in code such as spelling errors
• execution errors


  causes the program to crash unexpectedly.
• logic error


  produces unexpected results
• fitness for purpose


  a program is fit for purpose if it meets the requirements specification set out during the analysis phase. Specifically, the final program should match the purpose and functional requirements.
• efficient code


  efficient code uses less resources (processor, RAM) and executes more quickly.