Programming Basics

Programming Basics

1. Design Methodology

   • Steps
     • 1. Define the output and data flows
       • -Create an output definition with the headers Field, Type and Description. -Utilise program development systems such as Visual Basic or try Rapid Application Development
       • 2. Develop the logic to get to that output
         • 3. Write the program
         • Using flowcharts or pseudocode
       • Top-down design

2. JavaScript

   • Displaying output
     • document.write
     • prompt
     • alert
   • Math operators
     • ( ) *, /, %(modulus) +, -
   • Inputting variables
     • The usage of var to precede the name of the variable is optional
     • Array of characters & numbers
   • String methods
     • Make all capital or lowercase
       • eg. newtown1 = hometown.toLowerCase(); eg. newtown2 = hometown.toUpperCase();
     • Replacing parts
       • eg. hometown = hometown.replace("Salt", "Blue");
   • Numeric Functions
     • parseInt(), parseFloat()
     • Math functions
       • Math.(floor,round,abs,atn,sin,cos,tan,exp,log)(numeric value)
   • Decision statement
     • if, else, else if
     • Relational operators
       • < , >, ==, >=, <=, != (not equal to)
   • Looping
     • for, while, do...while (the only difference between while and do...while is the placement of the condition, the latter makes sure the program runs once before the condition is tested.
   • Creating functions and storing them together
     • -Storing functions in a js file -Calling them from the same folder as html file using to provide file path

3. Structured Programming

   • The 3 Constructs
     • Sequence
     • Decision
     • Looping
   • Program Testing
     • Desk checking
     • Beta testing
     • Parallel Testing