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21. Given the following Pascal-like program segment Procedure A, x, y : integer ; Procedure B; x, z : real ; S1 end B; Procedure C; i : integer ; S2 end C end A; The variables accessible in S1 and S2 are
x of A, y, x of B and z in S1 and x of B, y and i in S2
x of B, y and z in S1 and x of B, i and z in S2
x of B, z and y in S1 and x of A, i and y in S2
none of these
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22. An intermediate code form is
postfix notation
syntax trees
three address codes
all of these
23. Three address code involves
exactly 3 address
at the most 3 address
no unary operators
24. The best way to compare the different implementations of symbol table is to compare the time required to
add a new name
make an inquiry
add a new name and make an inquiry
25. Advantage of panic mode of error recovery is that
it is simple to implement
it never gets into an infinite loop
both (A) and (B)
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