Always use parentheses to disambiguate the precedence of operators if there is any question or opportunity for confusion.
The arithmetic operators all work like they do in normal mathematics. The remainder (%) operator returns the remainder from an integer division.
The increment and decrement operators can be used to easily increment or decrement numbers. Avoid the postfix versions of these operators whenever possible.
Beware of side effects, particularly when it comes to the order that function parameters are evaluated. Do not use a variable that has a side effect applied more than once in a given statement.
The comma operator can compress multiple statements into one. Writing the statements separately is usually better.
The conditional operator (?:) (also sometimes called the arithmetic if operator) is a ternary operator. Given c ? x : y, if c evaluates to true then x is evaluated, otherwise y is evaluated. Parenthesize:
- The entire operator when used in compound expressions
- The condition if it contains any operators
Relational operators can compare floating point numbers, but avoid equality/inequality checks. Logical operators allow formation of compound conditional statements.