Microcontrollers

Compound operators combine an arithmetic or bitwise operation with an assignment operation. These are all unary operations in that they take a single operand. Compound operators are not mandatory to use as all compound operations can otherwise be accomplished by setting a variable equal to the operation taking place with that same variable. (As an example, a variable a could be incremented with a compound operation a++ or with an assignment and arithmetic operation a = a + 1.) Compound operators can save execution time in that using assignment and arithmetic/bitwise operations may require the variable to be looked up twice if the compiler does not recognize that the two parts of the expression are identical.

Compound operators are described in Table 14.7.1.