Operators are the symbols which are used to work with variables. You are already familiar with simple arithmetic operators, plus and minus.
Important: While the x++ and ++x operators both add one to x, they are not identical. x++ increments x after the assignment and ++x before. If x is 4, y = x++ results in y is 4 and x is 5. y = ++x sets y = 5 and x = 5. The x– and –x operators work similar.
If you mix numeric and string values when adding to values together, the result is a string. HTMLcenter + 69 results in HTMLcenter69.
Operators  
OPERATOR x + y (numbers) x + y (string) x – y x * y x / y x % y x++, ++x x–, –x x

WHAT IT DOES Adds x + y Adds x and y string Subtracts y from x Multiplies x and y Divides x by y Remainder of x / y Adds one to x Subtracts one from x Reverses the sign of x
