COMP 110
Fall 2008
Assignment 3: Simple Arithmetic Calculator
Due: Mon. Sept 22 at 12:00 midnight
For this assignment you will create a web page with an embedded JavaScript program.
You will store this program as an HTML file in your UNC web space, and you will give
it an 8-character or more filename that only you know. Then we can retrieve, run, and
grade it by pointing our browser www.unc.edu/~ yourOnyen/yourSecretName.html but no
one else can see it without making a really good guess at what you named it.
This program will exercise the concepts you have been learning to date. It will require
you to write a loop, use conditional (if) statements, do input via prompt, do output via
alert, create named constants, produce arithmetic expressions, do assignment to variables.
Specs
Use a simple text editor to create this program. Do not use Web generation tools.
You are to write a program that will act like a simple 5-function calculator. The user is
able to get 5 different kinds of arithmetic operations: addition, subtraction, multiplication,
division, and square roots. When the program first runs, it will ask the user to enter a
number 0 to 5. Then it will perform the operation corresponding to that input value
based on this table:
0. end the program
1. do addition
2. do subtraction
3. do multiplication
4. do division
5. do square root
So, for example, if the user gives the number 2, your program will do a subtraction. To
accomplish this, the program will ask the user for two more numbers; it will then perform
the appropriate arithmetic operation on that number and then report the results to the user.
Make your output read nicely, and make sure it explains the activity. For example, if the
user asks to multiply, and gives the numbers “5” and “2.3” don’t write “11.5”…instead
print “5 times 2.3 is 11.5”
Once the requested operation is done, the program will loop back and ask for another
operation selection. Do this looping/computing until the user enters the flag value “0”,
at which time the entire program will end. Note that if the user selects operation 5
(square root) the program only needs to ask for 1 additional number.
For input, use the “prompt” statement, and for output use the “alert” statement.
