2.2 programming

2.2 programming

1. variables, inputs, outputs and assignment

   • programs accept inputs from the user
   • we can label various inputs and constants
   • it is called a 'variable' if it changes throughout the program
     • allow programs to have different purposes
   • but a 'constant' if it doesn't change

2. variables : operators

   • Boolean - AND, OR, NOT
     • AND - two conditions must be true for statement to be true
     • OR - at least one of the values has to be correct
     • NOT - inverts the results
   • addition
   • subtraction
   • division
   • left
   • mid
   • right
   • modular division - how many times a number can go into another with a remainder

3. iteration

   • while
   • for
   • counter
   • condition
   • boolean
   • iteration
   • break
   • nested iteration

4. Text files are used to store a variety of data: lists of names, logs of events, tables of data

   • SQL- Standard Query Language
     • SELECT
     • SELECT- FROM- WHERE-