Params

Question 1

r-value

Answer 1

value of an expression

Question 2

l-value

Answer 2

location or address of expression

Question 3

Parameter passed by value

Answer 3

calling method copies the r-value of the arg into the called method’s AR

Question 4

Value result param passing

Answer 4

value of the param is copied into called AR but when method ends, final values copied back into args

Question 5

When can aliasing occur

Answer 5

pointer manipulation
parameter is passed by reference and is also global to called method
parameter is passed by reference using same expression as an arg more once

Question 6

Difference for globals between pass by ref and pass by value result

Answer 6

pass by ref - local var has link to global

pass by value result - treat local and global as separate in function, then when function returns update global

Question 7

Call by name

Answer 7

every call statement is replaced by the body of the called method
each occurrence of a parameter in the called method is replaced with the corresponding arg

Question 8

Benefit of call-by-name

Answer 8

more efficient when passing parameters that are never used