Desk Calculator



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 = ab ). If the expression is legal, output its value, else output an error message.



Input Specification:

Your program must read test cases 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

ERROR IN INFIX NOTATION

- Desk Calculator



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 = ab ). If the expression is legal, output its value, else output an error message.



Input Specification:

　Your program must read test cases　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

ERROR IN INFIX NO