Project #1: Desk Calculator

Task:

• This project requires you to write a program that imitates a simple desk calculator. Your calculator must be able to accept an infix expression which at least includes (, ), +, -, *, /, %, and ^ (exponentiation operator, a^b = a^b ). If the expression is legal, output its value, else output an error message.

Input Specification:

Your program must read test cases from a file “input.txt”. In the file there are several test cases, each occupies one line that contains an infix expression. Proceed until the end of the file.

Output Specification:

For each test case, output to a file “output.txt” in one line the value of that expression (accurate up to two decimal places), or an error message “ERROR IN INFIX NOTATION”.

Sample Input:

4.99+5.99+6.99*1.06

(3*5*(4+8)%2)

2^2^3

1+2(

2/0

(2-4)^3.1

2.5%2

2%2.5

Sample Output:

18.39

0.00

256.00

ERROR IN INFIX NOTATION

ERROR IN INFIX NOTATION

ERROR IN INFIX NOTATION

ERROR IN INFIX NOTATION

^{Sample of Project Report}