Write a calculator program. A minimal calculator will support the following functions:
Your calculator should keep on running until explicitly told to quit. I suggest typing a zero as the first operand to cause it to quit, i.e.
>2 + 3 5 >4 * 9 36 >0 + 2 Bye, now.
Programs may support other features if desired. Suggested other functions to add include:
Interested students might look at the documentation for
to find help with some of the above functions. Also, some
may wonder how to deal with the first operand possibly being a
character or a number. That is, how can your program support
phrases like "2 + 3" (
double String double) and "sin
String double) at the same time? Well, if you
read in everything as a
String, then I've
written some functions you can use to convert to other things.
Numeric.isNumeric( String s ) // returns true if s is a number Numeric.isInteger( String s ) // returns true if s is an integer Numeric.isDouble( String s ) // returns true if s is a double Double.valueOf( String s ) // returns the double that s represents Integer.valueOf( String s ) // returns the int that s represents
Any program which presents me with a screen like the following will not receive a very good score.
Enter the function you wish to perform. 1) addition 2) subtraction 3) multiplication 4) division 5) quit Your choice:
Also, the same fate applies to any program that ever presents me with the following message:
Would you like to calculate again? (y/n)
Finally, you may use the built-in
Math.pow() function in
order to compute powers, but those that write their own will receive a
much higher score.
©2013 Graham Mitchell
This assignment is licensed under a
Creative Commons Attribution-NonCommercial-ShareAlike 3.0 United States License.