Introduction to Perl

Faq.txt

Q1. What is the syntax for multiline comment in perl ?
ans: syntax : =begin  .....comments .....=end =cut

Q2. is there a integer data type in perl ?
ans: No , perl have three data types : scalar,array and hashes.

Q3. How do we access a scalar variable in perl?
ans: We use sigil ($) before every scalar variable while accessing.

Q4. what is difference while print' ' and print" " ?
ans: Only double quotes "interpolate" variables and special characters such as newlines (\n).
     Whereas single quotes will print the variable and special character literally.

Mcq.txt

Q1.What will be the output of this statement :
    
    print 'Hello \n world';
    
a) Hello
   world

b) Error
c) Hello world
d) Hello \n world

ans: d)

Q2.What will be the output of this statement :
        
      printf("%.2f",12.222223);
 
 a)12.23
 b)12.222
 c)12.22
 d) 12.222223
 
 ans: c)
 
 Q3.Output of this code :
    
    my $bigint = 18446744073709551615;
    printf("%d\n",$bigint+1);
    printf("%u",$bigint+1);

a) 18446744073709551615
   18446744073709551615
b) 18446744073709551616
   18446744073709551615
c) -1
    18446744073709551615
d) 18446744073709551616
   18446744073709551616
   
ans : c)


Q4.Is the below statement correct way to swap three variable ?
    
    my $a=10,$b=11,$c=12;
    ($a,$b,$c)={$b,$c,$a}; 

a) true
b) false

ans: b)

Q5.   my $a=<STDIN>;
      print $a;
      print $a; 
      
what will be the output if the input is "pep":

a) peppep
b) pep
   pep
c) pep pep
d) None of the above

ans: b)