The Four-Function Calculator: Our First Simple Application
We can combine this understanding of statefulness and events to make our first simple
This calculator is just a collection of two QTextBox
objects (one for each operand), a
object containing the four arithmetic functions, a QButton
object to execute
the operation, and a QLabel
to view the result.
Note that there is no validation, checking, etc. currently in the Qform. Any string data
will be parsed by PHP to see if there is any numeric data, and if not, it will be parsed as 0. Dividing
by zero will throw a PHP error.