The boolean data type represents true/false or yes/no values. The single character 'Y' is used for true/yes, and the single character 'N' is used for false/no.
boolean could be considered as a subtype of the char datatype, since it follows the same rules, only with additional restrictions on the character. However, it is considered as a primitive in its own right.
| Example | Valid | Notes |
|---|---|---|
| Y | ||
| N | ||
| y | Should be uppercase | |
| n | Should be uppercase | |
| true | More than one character | |
| t | Not Y or N |