Class 4   W 1/23  Comp 110  

Outline
	Variables
	Strings


Terms to know:
	variable
	variable declaration
	variable initialization
	assignment statement
	data type
	literal
	named constant - not covered W 1/23

variables store data in main memory
variables have mnemomic names: n1 average studentName


value = data stored in variable
examples of values:  17  "comp110-001"  3.14



Data type
	set of values
	set of operations on those values

int		       	String
{..., -1, 0, 1, 2 ...}	"" "a" "ab" "abc" ....
1 very different from "1"

+ - / = SOP(n1)		find(substring, sting)
			+   =   SOP(string)
			"comp110 " + "rocks" "comp110 rocks"