AWK supports almost all basic arithmetic operators for building arithmetic expressions. These operators are binary operators; that is, they operate on two variables and are very similar to C language expressions. All these arithmetic operators follow the normal precedence rule. AWK supports the following arithmetic operators.
Addition (p + q):
This is represented by a plus (+) symbol, which adds two or more numbers. These numbers could be variables or constants. For example, we can add two numbers after assigning them to two variables as follows:
$ awk 'BEGIN{ p = 20; q = 30; print "( p + q ) = ",( p + q )}'
The output on execution of this code is as follows:
( p + q ) = 50
Now, we will use the marks.txt sample file to calculate the sum of marks obtained by a student using the arithmetic operator, as follows:
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