Due: 14 Sept
Make another calculator program. It
looks like the image below. It behaves like the
Calc2.exe at the class web site.
Hints: have a global variable that stores the value of the first
number (or previous result). Have another variable that records which operation button was pressed (and thus will indicate which operation to perform after the second number and the = button have been pressed).
Build the program one step at a time; the entire thing need not and
should not be done at once. I suggest getting manual entry of a number
into the text box, clicking Add button, then the next number manually
entered and then the = button working first. Then add the other
operation buttons (they will have the same code as the Add
button). Then add the digit buttons, or maybe the +/-, or maybe the .,
or maybe the Clear. Error detection can be added somewhere along the way.