15.2.2 Arithmetic Operators

The complex arithmetic library defines all the basic arithmetic operators. Specifically, the following operators work in the usual way and with the usual precedence:

+ - / * =

The subtraction operator (-) has its usual binary and unary meanings.

In addition, you can use the following operators in the usual way:

• Addition assign operator (+=)

• Subtraction assign operator (-=)

• Multiplication assign operator (*=)

• Division assign operator (/=)

However, the preceding four operators do not produce values that you can use in expressions. For example, the following expressions do not work:

complex a, b;
...
if ((a+=2)==0) {...}; // illegal
b = a *= b; // illegal

You can also use the equality operator (==) and the inequality operator (!=) in their regular meaning.

When you mix real and complex numbers in an arithmetic expression, C++ uses the complex operator function and converts the real values to complex values.