boolean is the type identifier for a built-in enumerated type with two values false and true defined as below:
boolean = (false, true);
The ordinal value of false is zero and the ordinal value of true is one. The conditional statement:
For example below is a simple program that illustrates using the built-in type boolean:
program Teenager(input, output); var age : integer; teenager : boolean; begin write('How old are you?'); readln(age); teenager := (age >= 13) and (age <= 19); if teenager then writeln('Congratulations!!! You are a teenager') else writeln('Sorry. You are not a teenager') end.
Operating Systems: All Standard Pascal: Yes