Computational 
General Comments: The computational operators perform a mathematical function on a value or values, and return a single value. 
Operator

What does it do? 
Example/Explanation 
+ 
Adds two values together 
counter+2
Returns the sum of the counter plus 2 
 
Subtracts one value from another 
counter2
Returns the sum of the counter minus 2 
* 
Multiplies two values 
counter*10
Returns the result of the variable times 10 
/ 
Divides the value on the left by the one on the right and returns the result 
counter/2
Divides the current value of the counter by 2 and returns the result 
++X 
Increments the value, and then returns the result 
++counter
Looks at the current value of the counter, increments it by one, and then returns the result. If the counter has a value of 3, this equation returns the value of 4. 
X++ 
Returns the value, and then increments the value 
counter++
Returns the value of the counter, then increments the counter. If the counter has a value of 3, this equation returns the value of 3, then sets the counter value to 4. 
X 
Decreases the value, and then returns the result 
counter
Looks at the current value of the counter, decreases it by one, and then returns the result. If the counter has a value of 7, this equation returns the value of 6. 
X 
Returns the value, and then decreases the value 
counter
Returns the value of the counter, then decrease the counter value. If the counter has a value of 7, this equation returns the value of 7, then sets the counter value to 6. 