Hashes in Perl

Faq.txt

Q1. What symbol is use to represent the hashes in perl?
ans: The % symbol is use to represent hashes in perl.

Q2.How can we convert a hashes to an array?
ans: We can convert a hashes to an array using this syntax: my @var = %hashes.

Q3.How can we access item from a hash in perl?
ans: We will use sigil $ while accessing the item in hash. syntax: hash

Q4.What function is use to check if a key in present in a hash?
ans We use exists operator to check whether a key is present or not.

Mcq.txt

Q1.What will be the output of this statement:
    my %hash=("a"=>96,
    "b"=>98,
    "c"=>99);

    print $hash{"c"}++;
    
a) 99
b) 100
c) error
d) c=>99

ans: a)

Q2.What will be the output:
    my %hash=("a"=>96,"b"=>98,"c"=>99);
    my @var=%hash;
    print @var[2];
    
a) b
b) a
c) error
d) not able to defined.

ans: b)

Q3.What will this statement give:
    my %hash=("a"=>96,"b"=>98,"c"=>99);
    my $k=keys %hash;
    print $k;

a) all the keys
b) The fisrt key in the hash
c) the length of the hash
d) the number of keys in hash

ans: d)

Q4)What will be the output of the statement:
      my %hash=("a"=>96,"b"=>98,"c"=>99);
      while(my($k,$v)=each(%hash))
      {
        $hash{$k}++;
      };
      my @arr=@hash{'a','b','c'};
      print @arr;

a) 96,97,98,99
b) 969899
c) 97,99,100
d) 9799100

ans: d)