What do you think is the usual meaning of

1 + 2 * 3    ?

Answer:

Usually 1 + 2 * 3 means to do the multiplication first.

Operator Priority

To clear up these problems, arithmetic operators have each been given a priority. When there is a choice, do the highest priority operation first. The priorities of operators is given in the table. The highest priority is "1" and the lowest is "4".

Priority of Arithmetic Operators
operator	meaning	priority
^	power	1
-	negation	2
*	multiply	3
/	divide	3
+	addition	4
-	subtraction	4

For example:

      
1 + 2 * 3 
    -------
    * has higher priority than +, so do first

   =  1  +  6

   =  7

QUESTION 4:

Do this:

2 * 3 + 1