An operator is a symbol (such as =, +, or
>) that causes C# to take an action.
That action might be an assignment of a value to a variable, the addition
of two values, a comparison of two values, and so forth.
In the previous chapter, you saw the assignment operator used. The
single equals sign (=) is used to
assign a value to a variable; in this case, the value 15 to the variable
myVariable:
myVariable = 15;
C# has many different operators that you’ll learn about in this chapter. There’s a full set of mathematical operators, and a related set of operators just for incrementing and decrementing in integral values by one, which actually are quite useful for controlling loops, as you’ll see in Chapter 5. There are also operators available for comparing two values, which are used in the branching statements, as I’ll demonstrate in the next chapter.
The assignment operator causes the operand on the left side of the operator to have its value changed to whatever is on the right side of the operator. The following expression assigns the value 15 to myVariable:
myVariable = 15;
The assignment operator also allows you to chain assignments, assigning the same value to multiple variables, as follows:
myOtherVariable = myVariable = 15;
The previous statement assigns 15 to myVariable, and then also assigns the value
(15) to myOtherVariable. This works
because the statement:
myVariable = 15;
is an expression; it evaluates to the value assigned. That is, the expression:
myVariable = 15;
itself evaluates to 15, and it is this value (15) that is then
assigned to myOtherVariable.