AMU MCA Computer Previous Year Questions (PYQs) – Page 14 of 14
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In C++, the declaration
int x; int &p = x;
is same as the declaration
int x, *p; p = &x;
This remark is
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Solution
Reference (&) is not same as pointer (*).
Reference cannot be reseated, pointer can.
Assume rand() returns an integer between 0 and 10000 (both inclusive). To simulate throwing a die:
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Solution
Dice values = 1 to 6
rand() % 6 gives 0–5
Add 1 → 1–6
For a method to be an interface between the outside world and a C++ class, it must be declared
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Solution
To be accessible from outside the class, it must be public.
To sort many large objects or structures, it is most efficient to place
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Solution
Sorting pointers avoids copying large objects.
Consider a noise less channel with bandwidth of 3000 Hz transmitting a signal with two signal levels. Maximum bit rate can be
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Solution
Using Nyquist Formula:
$C = 2B \log_2 M$
Here $B = 3000$, $M = 2$
$C = 2 \times 3000 \times \log_2 2$
$= 6000 \times 1$
$= 6000$ bps
Express the boolean function $F = xy + x'z$ in product of maxterms form
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Solution
Find minterms where $F=1$
$F = xy + x'z$
Truth table gives 1 at minterms: $m(1,3,6,7)$
So zeros at: $0,2,4,5$
Product of maxterms form:
$\pi(0,2,4,5)$
In C++, a variable defined within a block is visible
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Solution
Block scope variable is visible only inside that block from its declaration onward.
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