Книги автора: Fedora™ Unleashed, 2008 edition
/ Книги автора: Fedora™ Unleashed, 2008 edition
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Книга: Fedora™ Unleashed, 2008 edition
Arithmetic Operators
Arithmetic Operators
Perl supports a wide variety of math operations. Table 25.4 summarizes these operators.
TABLE 25.4 Perl Arithmetic Operators
| Operator | Purpose |
|---|---|
x**y |
Raises x to the y power (same as x^y) |
x%y |
Calculates the remainder of x/y |
x+y |
Adds x to y |
x-y |
Subtracts y from x |
x*y |
Multiplies x times y |
x/y |
Divides x by y |
-y |
Negates y (switches the sign of y); also known as the unary minus |
++y |
Increments y by 1 and uses value (prefix increment) |
y++ |
Uses value of y and then increments by 1 (postfix increment) |
--y |
Decrements y by 1 and uses value (prefix decrement) |
y-- |
Uses value of y and then decrements by 1 (postfix decrement) |
x=y |
Assigns value of y to x. Perl also supports operator-assignment operators (+=, -=, *=, /=, %=, **=, and others) |
You can also use comparison operators (such as == or <) and compound pattern operators (&&, ||, and !) in arithmetic statements. They evaluate to the value 0 for false and 1 for true.
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