Tag: programming languages

To determine the output of the given code, let's go through each option:

Option A) 1 3 9

• This option is incorrect because it only includes the values 1, 3, and 9. It does not take into account the values 5 and 7.

Option B) 5 5 7 7

• This option is incorrect because it includes duplicate values. The code does not print the same value multiple times in a row.

Option C) 1 3 3 9 9

• This option is incorrect because it includes duplicate values. The code does not print the same value multiple times in a row.

Option D) 1 1 3 3 9 9

• This option is correct. Let's go through the code step by step to understand why:
  • The array ia contains the values {1, 3, 5, 7, 9}.
  • The outer for loop iterates over each element x in ia.
  • The inner for loop iterates three times.
  • For each iteration of the inner for loop, the code checks if x is greater than 4 and less than 8. If it is, the continue statement is executed, skipping the rest of the inner loop.
  • If x is not greater than 4 and less than 8, the code prints the value of x.
  • After the first iteration of the inner loop, the code encounters a break statement when j is equal to 1, which stops the inner loop.
  • The outer loop then continues to the next element in ia.
  • The code prints the values 1, 1, 3, 3, 9, 9, which matches option D.

Option E) 1 1 1 3 3 3 9 9 9

• This option is incorrect because it includes duplicate values. The code does not print the same value multiple times in a row.

Option F) Compilation fails

• This option is incorrect. The code does not have any syntax errors and will compile successfully.

The correct answer is option D) 1 1 3 3 9 9. This option is correct because it accurately represents the output of the given code.

• Thanks
• Wrong explanation

To answer this question, let's break down the code and go through each option:

The code initializes a scalar variable $val with a value of 'x'.

The ref() function in Perl is used to determine the reference type of a variable. If a variable is not a reference, ref() will return an empty value.

Option A) SCALAR - This option is incorrect because ref() does not return the reference type of the variable in this case. It will return an empty value.

Option B) empty value - This option is correct because ref() will return an empty value since $val is not a reference.

Option C) STRING - This option is incorrect because ref() does not return the reference type of the variable in this case. It will return an empty value.

Option D) "not a reference" - This option is incorrect because the code does not explicitly output the string "not a reference". It will return an empty value.

The correct answer is B. The code will print an empty value.

• Thanks
• Wrong explanation

To determine the value of $val, let's break down the code step by step:

my $str = 'aa bb cccc';
my $val = () = $str =~ /\w+/g;

In the second line, the regular expression /\w+/g is used to match one or more word characters in the string $str. The g modifier indicates that the regular expression should be executed globally, meaning it will match all occurrences in the string.

The $str =~ /\w+/g expression returns a list of all the matches found in the string. In this case, the matches are 'aa', 'bb', and 'cccc'.

The () surrounding the assignment operator = in the line $val = () = $str =~ /\w+/g is known as the list context. It forces the right-hand side of the assignment to be evaluated in a list context.

The () = $str =~ /\w+/g expression assigns the matches to an empty list (). However, the assignment is happening in a scalar context, so the empty list is being evaluated as the number of elements in the list.

Therefore, the value of $val will be the number of matches found, which is 3.

The correct answer is D) 3.

• Thanks
• Wrong explanation