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KEY (100% COMPLETE SOLUTIONS) 2026-2027 Q&A
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1. Which data structure follows the Last In, First Out
(LIFO) principle?
a) Queue
b) Stack
c) Linked List
d) Array
b) Stack
A stack operates on LIFO: the last element pushed
is the first one popped. A queue follows FIFO.
Linked lists and arrays are linear structures
without inherent LIFO/FIFO ordering.
,2. What is the time complexity of accessing an
element by index in an array?
a) O(n)
b) O(log n)
c) O(1)
d) O(n²)
c) O(1)
Array indexing is a direct memory offset
calculation, so access by index takes constant time
regardless of array size.
3. Which of the following is NOT a primitive data
type in C?
a) int
b) float
c) string
d) char
c) string
,In C, string is not a primitive type; it is
implemented as an array of characters terminated
by a null character. int, float, and char are built-in
primitive types.
4. What will be the output of the following
expression: in C?
a) 3.5
b) 3
c) 4
d) 3.0
b) 3
Integer division in C truncates the decimal part.
Since both operands are integers, the result is an
integer, discarding the remainder.
5. Which loop is guaranteed to execute at least
once?
a) for loop
b) while loop
, c) do-while loop
d) None of the above
c) do-while loop
A do-while loop executes the body first and then
checks the condition, so the body always runs at
least once. for and while loops check the condition
before the first iteration.
6. What is the correct syntax for a function that takes
no arguments and returns nothing in C?
a) void func()
b) func(void)
c) int func()
d) Both a and b
d) Both a and b
In C, both void func() and func(void) are valid
ways to declare a function with no parameters
returning void. The void inside parentheses
explicitly means no arguments.