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Assignment Operators
Assignment Operators do exactly what their name suggests,
they assign values. The most common occurence of an assignment
operator is when you initialize your variables. The following
table outlines the different assignment operators used widely
in perl scripts, note: these are used in conjunction with
our arithmetic operators in lesson
(6.1):
| = |
Normal
assignment of values |
| += |
Add
then Assign value |
| -= |
Subtract
then Assign value |
| *= |
Multiply
then Assign value |
| /= |
Divide
then Assign value |
| **= |
Exponent
then Assign value |
| %= |
Modulus
then Assign value |
The above operators often are used to save typing the longer
versions of the same assignment which can ultimately decrease
the amount of code in your script... below is some sample
code to get your feet wet:
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#
This calculation will find total web page visits for
1
# year assuming we know each months' visits
# Note: this same example used in our arithmetic
# operators tutorial can also be used to demonstrate
# our assignment operators...the initialization of the
# month variables below are using the normal
# assignment operator mentioned above...
$january=345;
$february=256;
$march=444;
$april=541;
$may=678;
$june=350;
$july=411;
$august=398;
$september=500;
$october=758;
$november=648;
$december=1555;
# To be safe...it would be wise to place the following
# statement all on 1 line in your code...
$total_visits=$january+$february+$march+$april+
$may+$june+$july+$august+$september+
$october+$november+$december;
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