Multiple Choice Questions on JAVA (object oriented programming) bank 4 -- loops

MCQs BANK
Page: 1
Object Oriented
Programming
Topic: Loops
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This MCQs Bank contains question
and solution on adjacent(even-odd)
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MCQs BANK No.: 4

MCQs Bank on Object Oriented Programming
Topic : Loops
MCQ No: 1
Consider the following two
statement:
1: The while statement is a looping
construct that executes a block of
code while a condition is true.
2: The loop condition must be a
boolean expression.
a) Both 1 and 2 are TRUE
b) Only 1 is TRUE
c) Both 1 and 2 are FALSE
d) Only 2 is TRUE
Page: 2

Topic : Loops
MCQ No: 1 (Solution)
Ans: a) Both 1 and 2 are TRUE
Explanation:
The while statement is a looping
construct control statement that
executes a block of code while a
condition is true. You can either
have a single statement or a block
of code within the while loop. The
loop will never be executed if the
testing expression evaluates to
false. The loop condition must be a
boolean expression.
Page: 3

Topic : Loops
MCQ No: 2
In which loop the test is performed
at the end and the loop body
executes at least once?
a) while loop
b) for loop
c) do-while loop
d) all of these
Page: 4

Topic : Loops
Ans: c) do-while loop
Explanation:
The do-while loop is similar to the
while loop, except that the test is
performed at the end of the loop
instead of at the beginning.
This ensures that the loop will be
executed at least once. A do-while
loop begins with the keyword do,
followed by the statements that
make up the body of the loop.
Page: 5

Topic : Loops
MCQ No: 3
Which of the following loop use this
looping construct
(<initialization>; <loop condition>;
<increment expression>)
a) while loop
b) for loop
c) do-while loop
d) all of the above
Page: 6

Topic : Loops
Ans: b) for loop
Explanation:
The for loop is a looping construct
which can execute a set of
instructions a specified number of
times. It’s a counter controlled
loop. The syntax of the loop is as
follows:
for (<initialization>; <loop condition>;
<increment expression>)
<loop body>
Page: 7

Topic : Loops
MCQ No: 4
What will be the output of the
following program:
a) Infinite Loop
b) Hello
c) Compiler Error
d) Runtime Error
Page: 8

Topic : Loops
Ans: c) Compiler Error
Explanation:
The code gives Compiler Error.
There is an error in condition check
expression of for loop. Java differs
from C++(or C) here. C++
considers all non-zero values as
true and 0 as false. Unlike C++, an
integer value expression cannot be
placed where a boolean is
expected in Java.
Page: 9

Topic : Loops
MCQ No: 5
What will be the output of the
following code?
// filename Test.java
class Test {
public static void main(String[] args) {
for(int i = 0; true; i++) {
System.out.println("Hello");
break;
}
}
}
a) Hello
b) Infinite times Hello
c) Compiler Error
d) Runtime Error
Page: 10

Topic : Loops
Ans: a) Hello
Explanation:
The Program prints Hello 1 time only.
This is because although the
condition in the for loop is
true(always true) but there is a break
statement after the print statement,
which terminates the loop and
transfers the control outside the for
loop.
Page: 11

Topic : Loops
MCQ No: 6
What will be the output of the following
program:
class Test {
for(int i = 0; true; i++); {
break;
}
}
}
a) Executes but no output
b) Prints Hello
c) Runtime Error
d) Compiler error: break outside
switch or loop
Page: 12

Topic : Loops
Ans: d) Compiler error: break
outside switch or loop
Explanation:
If you note carefully there is a
semicolon just after the for loop.
This makes the for loop as do
nothing loop, because the for loop
body is terminated at the
semicolon.
Now, break statement must be
inside some loop block or switch-
case block. As the break statement
is not inside any loop body it
generates error during compilation.
Page: 13

Topic : Loops
MCQ No: 7
What will be the Output of the following
code?
class Test {
for(int i = 0; true; i++); {
//break;
}
}
}
a) Executes but print nothing
b) Prints Hello
c) Compiler Error:unreachable statement
d) Runtime Error
Page: 14

Topic : Loops
Ans: c) Compiler Error:
unreachable statement
Explanation:
In the for loop there is a semicolon
at the end of loop, which makes the
loop as do-nothing loop. Also the
condition of the loop is always true
which results in executing the blank
statement infinite times. The flow of
the program gets stuck at for loop
statement and the print statement is
never reached, as a result it give
“unreachable statement” error.
Page: 15

Topic : Loops
MCQ No: 8
What will be the output of the following code?
class Test {
for(;;) {
break;
}
}
}
a) Hello
b) Compiler Error
c) Runtime Error
d) Print Hello infinite times
Page: 16

Topic : Loops
Ans: a) Hello
Explanation:
All the sections in the for-loop
header are optional. Any one of them
can be left empty, but the two
semicolons are mandatory. In
particular, leaving out the <loop
condition> signifies that the loop
condition is true. The (;;) form of for
loop is commonly used to construct
an infinite loop.
In the for loop body there is a break
statement which terminates the for
loop.
Page: 17

Topic : Loops
MCQ No: 9
A _____________ stops the
iteration of a loop (while, do or for)
and causes execution to resume at
the top of the nearest enclosing
loop. Fill in the blank.
a) return statement
b) break statement
c) continue statement
d) None of these
Page: 18

Topic : Loops
Ans: c) continue statement
Explanation:
A continue statement stops the
iteration of a loop (while, do or for)
and causes execution to resume at
the top of the nearest enclosing loop.
You use a continue statement when
you do not want to execute the
remaining statements in the loop, but
you do not want to exit the loop itself.
Page: 19

Topic : Loops
MCQ No: 10
Which among the statements
transfers the control of the program
out of the enclosing loop ( for, while,
do or switch statement).?
a) return statement
b) break statement
c) continue statement
d) None of these
Page: 20

Topic : Loops
Ans: b) break statement
Explanation:
The break statement transfers
control out of the enclosing loop ( for,
while, do or switch statement). You
use a break statement when you
want to jump immediately to the
statement following the enclosing
control structure.
Page: 21

Multiple Choice Questions on JAVA (object oriented programming) bank 4 -- loops

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