Expressions
Expressions are used to compute values by applying operators to variables, constants and literal values. The operators for the predefined types include:
integer ops | +, -, *, /, % (modulus) |
e.g. (13+4)/5 is 3 |
real ops | +, -, *, / |
e.g. (13.0+4.0)/5.0 is 3.4 |
relational ops | ==, !=, >=, <=, >, < |
e.g. (6+2)<9 is true |
logical ops | && (and), || (or), ! (not) |
e.g. (6>8) || (3<4) is true |
bit-shift ops | >>, << |
e.g. 2<<10 is 2048 |
Precedence order:
- 1.
!
,not
(logical not)- 2.
*, /, %
- 3.
+, -
- 4.
>>, <<
- 5.
<, <=, >, >=
- 6.
==, !=
- 7.
&&
,and
(logical and)- 8.
||
,or
(logical or)
Increment and decrement operators (see section 8 on assignment statements):
count++
is equivalent tocount = count + 1;
count--
is equivalent tocount = count - 1;
Operators can be defined for user types. See the use of <<
and
>>
in section 11, and the --
member function in
the example class in section 18.