C++ offers negation, addition, subtraction, multiplication,
division, output, and assignment operators,
and C++ follows standard precedence and associativity rules.
If you want to make your arithmetic expressions
clearer, then use parentheses to create subexpressions.
The output operator has precedence lower than that of the arithmetic
operators. The assignment operator has still lower precedence.
If you wish to combine several output statements into one,
then instantiate the following pattern:
cout << first expression
<< second expression
<< ...
<< final expression;