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Addition and subtraction operators work on numerical values as you would expect:
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print 10+2; # Outputs 12 print 10-2; # Outputs 8
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Perl: The Complete Reference
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You cannot use the same operators for concatenating strings; instead use the operator:
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print $hello $world;
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The operator does not include a space in the concatenation, so this would output HelloWorld You ll either have to explicitly add the space or use double-quoted strings and interpolation:
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print "$hello $world";
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Shift Operators
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The shift operators shift the bits of an expression right or left, according to the number of bits supplied For example:
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2 << 8;
is 512 Be aware that if a floating point value is supplied to a shift operator, it is converted to an integer without rounding, that is, it is always rounded down, such that:
29 << 79;
produces 256, 2 shifted to the left 7 times
Named Unary Operators
Certain Perl functions are really named unary operators, that is, functions that take a single argument and return a value The exact list of unary operators is difficult to determine manually, but as a guide, the Perl source defines the following functions and operations as unary operators:
3:
Perl Parsing Rules
alarm caller chdir chr chroot cos defined delete do eval "string" exists exit exp
gethostbyname getnetbyname getpgrp getprotobyname gmtime goto hex int lc lcfirst length localtime lock
log lstat my oct ord quotemeta rand readlink ref require return rmdir scalar
FUNDAMENTALS
sleep sqrt srand stat uc ucfirst umask undef -X tests
If any of these are followed by an opening parenthesis, then they automatically have highest precedence; however, if you use them without parentheses, then their precedence is as listed within Table 3-1 lower than most calculations, but higher than most of the relational and logical operations For example, the rand function has a lower precedence than the multiplication operator, so
rand 10 * 20; # rand (10*20) rand(10) * 20; # (rand 10)*20;
You can always check these functions with Deparse if necessary
Perl: The Complete Reference
Also, remember that a comma automatically terminates a named unary operator, such that
print rand 10, 2;
prints a random number up to 10, immediately followed by the number 2 However, care needs to be taken with these operators in situations where Perl defaults to using the $_ operator For unary operators that do default to $_, failing to explicitly specify the variable may cause Perl to actually interpret any following operator as the start of a term For example,
print if length < 1;
will trick Perl into interpreting the < operator as the start of a filehandle input operator Other examples include *, which can be identified as a typeglob, and /, which can be misinterpreted as a regular expression pattern See Table 3-2 for a complete list If a term was expected and it happens to be of the form X, then Perl treats the operator as a file test operator see 7 for a complete description of the X operators
Character
+ * / < << % & Table 3-2
Operator
Addition Subtraction Multiplication Division Less than Left shift Concatenation Test Modulus Logical AND
Misinterpreted as
Unary plus Unary minus Typeglob (*var) Regex (/pattern/) Filehandle (<HANDLE>) Here document (<<EOF) Value (1) Regex ( pattern ) Hash (%hash) Subroutine call (&sub)
Misinterpreted Unary Operators
3:
Perl Parsing Rules
Relational and Equality Operators
FUNDAMENTALS
The relational and equality operators enable you to test the equality of numbers and strings, respectively The full list of relational and equality operators is given in Table 3-3
Operator < > <= >= == != <=> lt gt le ge eq ne cmp
Action Returns true if the left statement is numerically less than the right statement Returns true if the left statement is numerically greater than the right statement Returns true if the left statement is numerically less than or equal to the right statement Returns true if the left statement is numerically greater than or equal to the right statement Returns true if the left statement is numerically equal to the right statement Returns true if the left statement is numerically not equal to the right statement Returns 1, 0, or 1 depending on whether the left statement is numerically less than, equal to, or greater than the right statement, respectively Returns true if the left statement is stringwise less than the right statement Returns true if the left statement is stringwise greater than the right statement Returns true if the left statement is stringwise less than or equal to the right statement Returns true if the left statement is stringwise greater than or equal to the right statement Returns true if the left statement is stringwise equal to the right statement Returns true if the left statement is stringwise not equal to the right statement Returns 1, 0, or 1 depending on whether the left statement is stringwise less than, equal to, or greater than the right statement, respectively
Table 3-3
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