The numeric equality operators are used to test equality between numbers. For example,
while($x == 42) {
some code here
}
These operators work with numeric data.
It is an error to use these operators with strings.
Assignment Operators
Perl offers a wide variety of assignment operators, including many shortcut operators to handle
common tasks. Table 3-7 lists these operators. The lvalue is the left hand side of the operator and
the rvalue is the expression on the right.