basic.assignment

name = "george"

The variable "name" is assigned the string "george".

result = (unit.price * qty)

The variable "result" is assigned to the result of the arithmetic 
expression.

line = result: " is the answer"

The variable "line" is assigned the result of the string expression.

item<-1> = code

Adds the value of "code" as the last attribute of the dynamic array 
"item".

item<codes,-1> = code

Adds the value of "code" as the last value in an attribute of codes.

customer.array(5) = "fred"

The value, "fred", is assigned to the fifth element of the 
dimensioned array, "customer.array".

item<1,2,2> = "100"

The second subvalue in the second value in the first attribute of the string in 
"item" is replaces with the string "100".

string[3,2] = "ca"

Character positions 3 and 4 of "string" are replaced with the string 
"ca".

item<1,2,1>[3,2] = "ca"

The 3rd and 4th character positions of the string found in the first subvalue 
in the second value in the first attribute of "item" is replaced with 
the string "ca".