CODEWITHSUNDEEP
perlif-statement
Kalanidhi
Kalanidhi

Reputation: 5092

How to use else single line statement in Perl ?

I am beginner to Perl , I have trying to read the if...else statement. I tried if..else statement with curly braces.

if ( 1 ) { 
   print "True\n";  } 
else { 
 print "False\n" ; }

It working properly , then I searched in net how to use single line if statement without using curly braces, they provided same code.

     print "True\n" if (1 ) ;

I tried to use the else statement with that sample code 

  print "false\n" else ;

But I got error message .Can anybody explain how to use the single line else statement with if statement in perl.

Thanks in advance.

Upvotes: 2

Views: 4581

Answers (3)

tobyink
tobyink

Reputation: 13664

The postfix form of if, like this:

print "blah" if $x==1;

Is referred to as a "statement modifier". The list of all supported statement modifiers can be found in perlsyn. It is:

  • if EXPR
  • unless EXPR
  • while EXPR
  • until EXPR
  • for LIST
  • foreach LIST
  • when EXPR

Note that else and elsif are not amongst them. That means that if you need elsif or else clauses attached to your if, you need to use the longhand form.

Upvotes: 3

Lee Duhem
Lee Duhem

Reputation: 15121

I think what you are looking for is unless:

  1. if condition is true, do something

    print "True" if 1;

  2. if condition is false, do something

    print "False" unless 1;

Upvotes: 4

Miller
Miller

Reputation: 35198

Use a Ternary or conditional operator:

print 1 ? "True\n" : "false\n";

Update

Here's another way to get it all on one line:

if ( 1 ) { print "True\n";  } else { print "False\n" ; }

Upvotes: 5

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