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Operators And Expressions MCQ question and answer with solution | PHP Programming

Learn Operators And Expressions MCQ Questions and answers with easy and logical explanations. Operators And Expressions MCQ in PHP programming provides all type of technical mcq questions which is important for technical exams, cumpus exams and other entrance examination Page-10 section-1

Each section contains 100 MCQs on Operators and Expressions in php .
91
What will be the output of the following PHP code ? 

<?php
echo $x-- != ++$x;
?>
Discuss
Answer & Solution
Answer: Option A
Solution:
Automatically x is declared and initialized to 0,then decremented and compared with its increments, thus returns 1.
92
What will be the output of the following PHP code ? 
<?php
$auth = 1;
$status = 1;
if ($result = (($auth == 1) && ($status != 0)))
{
    print "result is $result";
}
?>
Discuss
Answer & Solution
Answer: Option B
Solution:
Result is x&&y which returns 1 if both x and y are true.
93
What will be the output of the following PHP code ? 
<?php
$i = 0;
while ($i = 10)
{   
    print "hi";
}
print "hello";
?>
Discuss
Answer & Solution
Answer: Option B
Solution:
While condition always gives 1.
94
What will be the output of the following PHP code ? 
<?php
$i = "";
while ($i = 10)
{   
    print "hi";
}
print "hello";
?>
Discuss
Answer & Solution
Answer: Option B
Solution:
While condition always gives 1.
95
What will be the output of the following PHP code ? 
<?php
$i = 5;
while (--$i > 0)
{   
    $i++;
    print $i;
    print "hello";
}
?>
Discuss
Answer & Solution
Answer: Option A
Solution:
i is decremented in the first while execution and then continuously incremented back.
96
What will be the output of the following PHP code ? 
<?php
$i = 5;
while (--$i > 0 && ++$i)
{   
    print $i;
}<
?>
Discuss
Answer & Solution
Answer: Option B
Solution:
As it is && operator it is being incremented and decremented continuously.
97
What will be the output of the following PHP code ? 
<?php
$i = 5;
while (--$i > 0 || ++$i)
{   
    print $i;
}
?>
Discuss
Answer & Solution
Answer: Option A
Solution:
As it is || operator the second expression is not evaluated till i becomes 1 then it goes into a loop.
98
What will be the output of the following PHP code ? 
<?php
$i = 0;
while(++$i || --$i)
{   
    print $i;
}
?>
Discuss
Answer & Solution
Answer: Option A
Solution:
As it is || operator the second expression is not evaluated and i is always incremented, in the first case to 1.
99
What will be the output of the following PHP code ? 
<?php
$i = 0;
while (++$i && --$i)
{   
    print $i;
}
?>
Discuss
Answer & Solution
Answer: Option C
Solution:
The first conditio itsef fails thus the loop exits.
100
What will be the output of the following PHP code ? 
<?php
$i = 0;
while ((--$i > ++$i) - 1)
{   
    print $i;
}
?>
Discuss
Answer & Solution
Answer: Option A
Solution:
(–$i > ++$i) evaluates to 0 but -1 makes it enters the loop and prints i which is 0.