i) Which of the following is true of l-values and r-values a) An l-value is a lo

ID: 3548000 • Letter: I

Question

i) Which of the following is true of l-values and r-values

a) An l-value is a logical value, and an r- value is a real value.

b)l-value are always to the left of r-values

c) An l-value refers to a variable's location while an r-value to its current value

d) l-values are local and r -values are relative.

ii) Which of the following situation will create a "dangling pointer"?

a) setting an arbitrary pointer variable to "null"

b)setting the CDR part of a CONS cell somewhere in the middle of a list to "null"

c)freeing a block to which there still exists a live pointer

d) freeing a block which still contains pointers to other existing block

iii) What distinguishes a purely "functional" programming language from an "imperative" one?

a) There are no variables and hence no assignment operation in a purely functional language

b) A purely functional language lacks the "go to" statement, but an imperative language always has such a command

c) All subprograms must be declared with the keyword function in a purely functional language