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1987-03-08
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(* Chapter 13 - Program 5 *)
MODULE ProcType;
FROM InOut IMPORT WriteString, WriteLn;
VAR OutputStuff : PROCEDURE(ARRAY OF CHAR);
VarLine : ARRAY[0..50] OF CHAR;
PROCEDURE WriteWithNote(InString : ARRAY OF CHAR);
BEGIN
WriteString("Written with a note ---> ");
WriteString(InString);
WriteLn;
END WriteWithNote;
PROCEDURE WriteWithComment(InputLine : ARRAY OF CHAR);
BEGIN
WriteString(InputLine);
WriteString(" <--- Written with a comment");
WriteLn;
END WriteWithComment;
BEGIN
VarLine := "This is a line of data.";
(* This uses WriteWithNote *)
OutputStuff := WriteWithNote;
OutputStuff(VarLine);
OutputStuff("Extra output ");
(* This uses WiteWithComment *)
OutputStuff := WriteWithComment;
OutputStuff(VarLine);
(* This uses WriteString *)
OutputStuff := WriteString;
OutputStuff(VarLine);
OutputStuff(" End of the line");
WriteLn;
(* The Procedures can be used in normal fashion too *)
WriteLn;
WriteWithNote("This is straight output.");
WriteWithComment("This too is straight output.");
WriteString(VarLine);
END ProcType.