By Laurence A Tepolt
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A for/to loop counts upward; a for/downto one counts downwards: for Counter := LowBound to HighBound do Statement for Counter := HighBound downto LowBound do Statement Once again, if the loop body is to contain multiple statements, they must be wrapped in a begin/end pair. The counter and bounds specifiers must be either of the same type exactly, or of types that are assignment-compatible with each other. g. ): var Ch: Char; begin for Ch := 'A' to 'Z' do //do something... The counter must be a local variable, however in the case of a function, the implicit Result variable is allowable too: function IndexOfFirstColon( const S: string): Integer; begin for Result := 1 to Length(S) do if S[Result] = ':' then Exit; Result := -1; end; No iteration is performed if the ‘high’ bound turns out to have a lower ordinal value than the ‘low’ bound: type TWorkDay = (Mon, Tues, Weds, Thurs, Fri); var MinDay, MaxDay: TWorkDay; begin MinDay := Thurs; MaxDay := Tues; for Day := MinDay to MaxDay do WriteLn('this line never executes'); Both low and high bound are evaluated only the once, immediately prior to the first iteration.
You might then expect strings to exhibit similar behaviour, given they are reference types too. '; //won't compile S := 'Won''t compile either'; V := 'Nor will this'; end; While amongst the reference types const only makes strings actually constant, it is still a good idea to use, assuming the routine isn’t intending to change the values passed. In the case of dynamic arrays and other managed types, it relieves the compiler from having to increment the argument’s reference count on entry and decrement it on exit; and for value types whose instances are more than a few bytes, const will cause the compiler to pass internally just a pointer to the source data rather than a copy of it, which is more efficient.
As an aside: begin/end pairs appear a lot in Delphi. e. , some descriptive text for the programmer’s benefit but ignored by the compiler. More comments Alongside curly brackets, Delphi also supports two other comment styles: (* *) and //. e. where the comment text may span more than one line. In contrast, a pair of forward slashes means the rest of the current line gets interpreted as a comment: (* Crucial procedure that does the following: - Nothing as yet. - Something in the future *) procedure Foo; //single line comment begin end; In the IDE, you can press Ctrl+/ to toggle single line comment markers for the selected line or lines.