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# Basic Operators

Arithmetic
 Arithmetic Name Result \$a + \$b Addition Sum of \$a and \$b \$a * \$b Multiplication Product of \$a and \$b \$a % \$b Modulus Remainder of \$a divided by \$b \$a ** \$b Exponentiation \$a to the power of \$b

String
 Example Name Result \$a . “string” Concatenation String built from pieces “\$a string” Interpolation String incorporating the value of \$a \$a x \$b Repeat String in which \$a is repeated \$b times

Assignment
The basic assignment operator is “=”: \$a = \$b. Perl conforms to the C idiom that lvalue operator= expression is evaluated as: lvalue = lvalue operator expression So that \$a *= \$b is equivalent to \$a = \$a * \$b \$a += \$b \$a = \$a + \$b This also works for the string concatenation operator: \$a .= “\n”

Autoincrement and Autodecrement
The autoincrement and autodecrement operators are special cases of the assignment
operators, which add or subtract 1 from the value of a variable:

++\$a, \$a++ Autoincrement Add 1 to \$a
--\$a, \$a-- Autodecrement Subtract 1 from \$a

Logical
Conditions for truth:
Any string is true except for “” and “0”
Any number is true except for 0
Any reference is true
Any undefined value is false
Example Name Result
\$a && \$b And True if both \$a and \$b are true
\$a || \$b Or \$a if \$a is true; \$b otherwise
!\$a Not True if \$a is not true
\$a and \$b And True if both \$a and \$b are true
\$a or \$b Or \$a if \$a is true; \$b otherwise
not \$a Not True if \$a is not true

Logical operators are often used to “short circuit” expressions, as in:
``open(FILE,”< input.dat”) or die “Can’t open file”;``

Comparison
Comparison Numeric String Result
Equal == eq True if \$a equal to \$b
Not equal != ne True if \$a not equal to \$b
Less than < lt True if \$a less than \$b
Greater than > gt True if \$a greater than \$b
Less than or equal <= le True if \$a not greater than \$b
Comparison <=> cmp 0 if \$a and \$b equal 1 if \$a greater -1 if \$b greater

## Conclusion

In this page (written and validated by ) you learned about Perl Basic Operators . What's Next? If you are interested in completing Perl tutorial, your next topic will be learning about: Perl Operator Precedence.

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