Homework 5: A One-Line Calculator

Assigned: Wednesday, February 8, 2006
Due: 8:00 a.m., Friday, February 10, 2006

Summary: In this assignment, you will write a very simple calculator.

Purpose: To give you an opportunity to explore issues of numbers in strings, particular with regards to input, output, and simple calculation.

Contents:

• The Assignment
• A Sample Session
• Hints
• Submitting Your Work
• Questions

The Assignment

Write a program that reads a one line arithmetic operation of the form

number operation number

and prints out the result.

You can choose whether to use BigInteger or BigDecimal values.

You can require that there be a space between the numbers and the operand.

A Sample Session

Expression: 23 * 13
23 * 13 = 299

Hints

You create a BigInteger from a string with the constructor which takes a string as a parameter. For example,

BigInteger leftOperand;
leftOperand = new BigInteger(exp.substring(0,exp.indexOf(" ")));

Submitting Your Work

When you are satisfied with your work, you should email me the program.

Questions

When you ask questions, I'll try to put the answers here.