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Programming in Perl Introduction

Programming in Perl Introduction. Peter Verhás January 2002. Hello Word. print ” Hello World!”; It is that simple just like BASIC!. Perl is an interpreted language. Program is text file Perl loads it, compiles into internal form Executes the intermediate code. Hello World # 2.

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Programming in Perl Introduction

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  1. Programming in PerlIntroduction Peter Verhás January 2002.

  2. Hello Word print ”Hello World!”; It is that simple just like BASIC!

  3. Perl is an interpreted language • Program is text file • Perl loads it, compiles into internal form • Executes the intermediate code

  4. Hello World # 2 $a = 123; $b = 55; $c = $a + $b; $d = "kakukk\n"; $d = 'kakukk\n' if $c == 178; if( $d eq "kakukk\n" ){ print "Hello World!\n"; }else{ print "This is not a good day!\n"; } OUTPUT: This is not a good day!

  5. Variables $a = 123; $b = 55; $c = $a + $b; $d = "kakukk\n"; $d = 'kakukk\n' if $c == 178; if( $d eq "kakukk\n" ){ print "Hello World!\n"; }else{ print "This is not a good day!\n"; } • Variables start with $ • There is nothing like reserved words • $else $if $while are good variables

  6. Strings $a = 123; $b = 55; $c = $a + $b; $d = "kakukk\n"; $d = 'kakukk\n' if $c == 178; if( $d eq "kakukk\n" ){ print "Hello World!\n"; }else{ print "This is not a good day!\n"; } • ”kakukk\n” is interpolated string • ’kakukk\n’ is NOT interpolated, 8 characters

  7. Numbers $n = 1234; # decimal integer $n = 0b1110011; # binary integer $n = 01234; # octal integer $n = 0x1234; # hexadecimal integer $n = 12.34e-56; # exponential notation $n = "-12.34e56"; # number specified as a string $n = "1234"; # number specified as a string

  8. This program is a liar $a = 123; $b = 55; $c = $a + $b; $d = "kakukk\n"; $d = 'kakukk\n' if $c == 178; if( $d eq "kakukk\n" ){ print "Hello World!\n"; }else{ print "This is not a good day!\n"; } • It prints This is not a good day! • which is actually not true, is it?

  9. Thank you for your kind attention.

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