statement

OpenTuring

statement

Syntax   A statement is one of:

 (a)assignmentStatement % variableReference := expn
 (b)openStatement % open
 (c)closeStatement % close
 (d)putStatement % put
 (e)getStatement % get
 (f)readStatement % read
 (g)writeStatement % write
 (h)seekStatement % seek
 (i)tellStatement % tell
 (j)forStatement % forend for
 (k)loopStatement % loopend loop
 (l)exit [ when trueFalseExpn ]
 (m)ifStatement % if end if
 (n)caseStatement % caseend case
 (o)assert trueFalseExpn
 (p)begin
   statementsAndDeclarations
  end
 (q)procedureCall % procedureId [(parameters)]
 (r)return
 (s)result expn
 (t)new [ collectionId , ] pointerVariableReference
 (u)free [ collectionId , ] pointerVariableReference
 (v)tag unionVariableReference , expn
 (w)forkStatement % fork
 (x)signal variableReference
 (y)wait variableReference [ , expn ]
 (z)pause expn
 (aa)quit [ guiltyParty ] [ : quitReason ]
 (bb)unchecked
 (cc)checked

Description   A statement (or command) causes a particular action, for example, the putStatement:

        put "Hello"
outputs Hello. See the descriptions of the individual statements for explanations of their actions. Each statement can optionally by followed by a semicolon (;).

Example  

        width := 24         % Assignment statement
        put "Hello world"   % Put statement
        exit when i = 100       % Exit statement
        assert width < 320  % Assert statement

Details   You can use a result statement only in a function. You can use a return statement only to terminate a procedure or the main program (but not to terminate the initialization of a module). See also result and return.

There are a number of predefined procedures, such as drawline, which are not listed as statements above. These are considered procedure calls, which is one form of statement.