You must follow the UML below as the basis to create a calculator using Java OOP.
The requirement of the calculator
1. Accept input from
a) Standard input (loop for waiting next input after printing the computation result)
b) Text file (file name: input. txt with multiple lines of arithmetic expression)
2. The input string is an arithmetic expression including parentheses () and only has one line
a) The operator and operand may not have a space character as the separator
b) For example, (10.1+200 -4.5x5.5)/(2-3x5)
c) If the input string has syntax error, terminate the program and tell what is wrong.
3. The operand can be an integer or a floating-point value and also negative number.
4. The operators include +, ,x,/ and ! (factorial)
5. If the output is not an integer, round to 4 decimal places.
a) if using command line or Eclipse console
i. Input: (-20-10.1+200 -4.5x5.5)/(2-3 x5)
ii. Output: = -11.1654
b) if using a text file (input. txt) as input, you should create an output file (output. txt)
i. Input: (-20-10.1+200 -4.5x 5.5)/(2-3x5)
ii. In output file: Input: (-20-10.1+200 -4.5x 5.5)/(2-3 x5)= -11.1654
iii. There are more than 1 input arithmetic expression in the file.