CSS 342 Extra Coding

This is a three part project:

• Part one - build a program that:
  • Prompts the user for a string of user input .
  • Treat that string as a mathematical expression in an infix form.
  • Convert the string into a series of tokens where each token is an operator, or a value delimited by whitespace , operator, or \n
• Part two -
  • Convert to postfix and print out the results. ( or print out an error if badly formed)
• Part Three - further.
  • Do the math to evaluate the expression when all operands are values ( not variables)

For this project the operators you will support are:

Plus +
Minus –
Times *
Divide /
Modula %

When I test the program I would expect to see something like this: ( Bold is what I enter on the command line)

Input an expression: A+ B * 31
Tokens: A + B * 31
Postfix: A B + 31 *
Value: Cannot be calculated

Input and Expression: 3+4*12
Tokens: 3 + 4 * 12
Postfix: 3 4 12* +
Value: 51

If the input expression is invalid, print out that fact. Use exceptions to catch any error conditions. (Note - put a space between each Token for clarity)