Data accessed by meaningful identifiers, used for data storage
Constants
Store values that won't change during execution
Procedures
Collection of programming statements under single identifier, allow modular programs to be created/allow procedures to be reused, make program creation faster, make programs shorter, easier to update/add functionality
Parameters
Pass values from main program to procedure, so they can be used in procedure, allow procedure to be reused with different data
Comments
Know purpose of code section
Storing data in file
Data stored permanently, data can be moved to another computer, backup copy/accessed elsewhere
ph0001 as primary key
Easy to validate, always unique
Making algorithm easier to understand/maintain
Comments, procedures/function, use white space
Local variables
Scope is defined block of code, value can't be changed elsewhere in program
Global variables
Scope is whole program, value can be changed elsewhere in program
what happens if invalid char in algorithm?
alg wouldnt stop - cant find item it seek
2) array run out of values after pointer reach 13 -> alg crash
