Question
Kindly share your solution in a presentable manner and also screenshot of output Please its my project its my posting 3rd time i need presentation
Kindly share your solution in a presentable manner and also screenshot of output
Please its my project its my posting 3rd time i need presentation mode with screenshot dont copy paste
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
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)
Each part will add up to 10 points to your coding grade in class.
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)
A few things that we have not talked about ( or talked about in class today)
How do you look at a string and know what the operands vs operators. IE if the input string is:
A+FRED+23*13-GG OR A + FRED +23* -GG
How do you identify that the tokens are A, FRED, 23, * etc. and which tokens are operands vs operators?
The easiest way is with a stack.
Put the first character on the stack.
Keep putting characters on until you see an unpend char ( a space) OR an operator or a
Pop the chars off the first stack onto a second
Pop the chars off the second stack ( now they are in proper order)
Pass the token to your infx to postgix code.
If you have an operator. Send that
Repeat until no more characters.
50% of grade will be does it work with simple test case
30% of grade. Does it work in all test cases
10% Format. Indentation readability
10% comments.
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