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- (* Chapter 3 - Program 6 *)
- program Illustrate_What_Boolean_Math_Looks_Like;
-
- (* notice the program name, it can be up to 63 characters long.
- Variables can also be very long as we will see below *)
-
- var A,B,C,D : boolean;
- A_Very_Big_Boolean_Name_Can_Be_Used : boolean;
- Junk,Who : integer;
-
- begin
- Junk := 4;
- Who := 5;
- A := Junk = Who; {since Junk is not equal to Who, A is false}
- B := Junk = (Who - 1); {This is true}
- C := Junk < Who; {This is true}
- D := Junk > 10; {This is false}
- A_Very_Big_Boolean_Name_Can_Be_Used := A or B; {Since B is true,
- the result is true}
- Writeln('result A is ',A);
- Writeln('result B is ',B);
- Writeln('result C is ',C);
- Writeln('result D is ',D:12); {This answer will be right justified
- in a 12 character field}
- Writeln('result A_Very_Big_Boolean_Name_Can_Be_Used is ',
- A_Very_Big_Boolean_Name_Can_Be_Used);
-
- (* Following are a few boolean expressions. *)
- A := B and C and D;
- A := B and C and not D;
- A := B or C or D;
- A := (B and C) or not (C and D);
- A := (Junk = Who - 1) or (Junk = Who);
- end.