Ada Programming/Operators

From Wikibooks, the open-content textbooks collection

Departments > Computing Deparment > Programming languages > Ada Programming

1 Standard operators
2 Shortcut operators
3 Membership tests
4 See also

[edit] Standard operators

Ada allows operator overloading for all standard operators and so the following summaries can only describe the suggested standard operations for each operator. It is quite possible to misuse any standard operator to perform something unusual.

Each operator is either a keyword or a delimiter -- hence all operator pages are redirects to the appropiate keyword or delimiter.

The list is sorted from lowest precedence to highest precedence.

[edit] Logical operators

and: and $x \land y$ , (also keyword and)
or: or $x \lor y$ , (also keyword or)
xor: exclusive or $(x \land \bar{y}) \lor (\bar{x} \land y)$ , (also keyword xor)

[edit] Relational operators

/=: Not Equal $x \ne y$ , (also special character /=)
=: Equal $x = y$ , (also special character =)
<: Less than $x < y$ , (also special character <)
<=: Less than or equal to ( $x \le y$ ), (also special character <=)
>: Greater than ( $x > y$ ), (also special character >)
>=: Greater than or equal to ( $x \ge y$ ), (also special character >=)

[edit] Binary adding operators

+: Add $x + y$ , (also special character +)
-: Subtract $x - y$ , (also special character -)
&: Concatenate , $x$ & $y$ , (also special character &)

[edit] Unary adding operators

+: Plus sign $+ x$ , (also special character +)
-: Minus sign $- x$ , (also special character -)

[edit] Multiplying operator

*: Multiply, $x \times y$ , (also special character *)
/: Divide $x / y$ , (also special character /)
mod: modulus (also keyword mod)
rem: remainder (also keyword rem)

[edit] Highest precedence operator

**: Power $x y$ , (also special character **)
not: logical not $\lnot x$ , (also keyword not)
abs: absolute value $| x |$ (also keyword abs)

[edit] Shortcut operators

The shortcut operators cannot be overloaded.

and then: e.g. if Y /= 0 and then X/Y > Limit then ...
or else: e.g. if Ptr = null or else Ptr.I = 0 then ...

[edit] Membership tests

The Membership Tests also cannot be overloaded.

in: element of, $var \in type$ , e.g. if I in Positive then, (also keyword in)
not in: not element of, $var \notin type$ , e.g. if I not in Positive then, (also keywords not in)