Difference between revisions of "Boolean"
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Revision as of 23:28, 20 August 2020
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Overview
Boolean is a logical data type. Data of type boolean has one of only two values, either true
or false
. A boolean variable is 1 byte in size.
The true
value can be assigned directly to a boolean variable or from the result of a comparison or test that was successful (true
). Similarly the false
value can be assigned directly or from the result of a comparison or test that was not successful (false
).
The Write() and Writeln() procedures will print a string that corresponds to the value of a boolean variable (either "TRUE" or "FALSE"). A Boolean variable can be used as the expression in an if statement. The WriteStr() procedure can be used to store a string literal representing a boolean variable's value in a string variable.
program booleantest;
var
tooLarge : Boolean = false;
boolString : ShortString;
begin
Writeln(tooLarge);
tooLarge := (0 = 0);
Writeln(tooLarge);
tooLarge := (3 > 5);
Writeln(tooLarge);
tooLarge := true;
Writeln(tooLarge);
if tooLarge then
Writeln('tooLarge is true')
else
Writeln('tooLarge is false');
WriteStr(boolString,tooLarge);
Writeln(boolString);
end.
Outputs:
FALSE TRUE FALSE TRUE tooLarge is true TRUE
See also
simple data types |
|
---|---|
complex data types |