Download The revised report on SCHEME, a dialect of LISP by Guy Lewis Steele PDF

By Guy Lewis Steele

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Example text

The while statement executes its constituent statement repeatedly, testing expression before each iteration. As long as expression returns True, execution continues. Syntactic elements 4-25 Declarations and statements Examples of while statements include while Data[I] <> X do I := I + 1; while I > 0 do begin if Odd(I) then Z := Z * X; I := I div 2; X := Sqr(X); end; while not Eof(InputFile) do begin Readln(InputFile, Line); Process(Line); end; For statements A for statement, unlike a repeat or while statement, requires you to specify explicitly the number of iterations you want the loop to go through.

Statement1 } else ... { statement2 } ; is equivalent to if ... { expression1 } then begin if ... { expression2 } then ... { statement1 } else ... { statement2 } end; The rule is that nested conditionals are parsed starting from the innermost conditional, with each else bound to the nearest available if on its left. To force the compiler to read our example in the second way, you would have to write it explicitly as if ... { expression1 } then begin if ... { expression2 } then ... { statement1 } end else ...

Else statement is if expression then statement1 else statement2 where expression returns a Boolean value. If expression is True, then statement1 is executed; otherwise statement2 is executed. For example, if J = 0 then Exit else Result := I/J; The then and else clauses contain one statement each, but it can be a structured statement. For example, if J <> 0 then begin Result := I/J; Count := Count + 1; end else if Count = Last then Done := True else Exit; Notice that there is never a semicolon between the then clause and the word else.

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